mc connell 2e_ppt_ch07
TRANSCRIPT
Chapter 7: Rocks and Minerals1. Earth Scientists: Nature
Detectives
2. Elements and Atoms: Basic Building Blocks
3. Minerals
4. Igneous Rocks
5. Sedimentary Rocks
6. Metamorphic Rocks
7. The Rock Cycle and Mineral Resources
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Earth Scientists: Nature Detectives
The Good Earth, Chapter 7: Rocks and Minerals
Are the rocks on Mars the same as rocks on Earth?
Earth Scientists: Nature Detectives
The Good Earth, Chapter 7: Rocks and Minerals
• Understanding rocks enables scientists to• Locate mineral resources (e.g., copper, gypsum)
• Find fossil fuels (e.g., oil, gas, coal)
• Assess the risk from natural hazards such as volcanic eruptions and tsunami
• Learn about Earth processes such as plate tectonics
• Discover the history and origins of other planets
Earth Scientists: Nature Detectives
The Good Earth, Chapter 7: Rocks and Minerals
Original ideas about how rocks formed• Neptunism
• Rocks formed in a global ocean when material sank to ocean floor or was precipitated from chemical reactions
• Plutonism• Heat from Earth’s interior melted rocks or
caused them to fuse together
Earth Scientists: Nature Detectives
The Good Earth, Chapter 7: Rocks and Minerals
Examination of the production of bricks – manufactured materials with some of the same characteristics as rocks - can provide clues to rock formation processes
Bricks are made from raw materials such as shale or fireclay found at Earth’s surface
Variations in the composition of raw materials produces different brick colors. Red bricks contain more iron.
Earth Scientists: Nature Detectives
The Good Earth, Chapter 7: Rocks and Minerals
Where do bricks come from?Raw materials smashed into smaller pieces in crusher.Crushed materials ground to smaller size by grinding wheel.
Resulting particles passed through a series of screens to sort materials by size.Sugar- and flour-sized particles mixed with water and other ingredients.
Earth Scientists: Nature Detectives
The Good Earth, Chapter 7: Rocks and Minerals
Small particles mixed with water and other ingredients.Wet mixture forced through brick-shaped form.Wet “bar” cut into smaller brick-sized pieces.
Excess water removed by passing wet bricks slowly through long dryers (200oC).Final stage is “firing” of bricks in kiln at high temperatures (1,100oC).
Earth Scientists: Nature Detectives
The Good Earth, Chapter 7: Rocks and Minerals
• Brick making, like rock formation, involves:− Physical disintegration of
raw materials
− Chemical changes
− Thermal effects
And brick making is influenced by the composition of the raw materials, just like the formation of rocks
Go back to the Table of Contents
Go to the next section: Elements and Atoms: The Basic Building Blocks
The Good Earth, Chapter 7: Rocks and Minerals
Elements and Atoms: Basic Building Blocks
The Good Earth, Chapter 7: Rocks and Minerals
ATMOSPHERE HYDROSPHERE
BIOSPHERE GEOSPHERE
• The geosphere is composed of rocks and related materials
Elements and Atoms: Basic Building Blocks
The Good Earth, Chapter 7: Rocks and Minerals
Rocks are made of minerals• ~20 common minerals
• Example: The rock granite (below) is composed of 4 key minerals - feldspar, quartz, mica, amphibole - and minor amounts of others.
quartz
feldspar
biotite mica, amphibole
Elements and Atoms: Basic Building Blocks
The Good Earth, Chapter 7: Rocks and Minerals
Minerals are made of elements• 8 common elements compose 98% of continental
crust rocks
Elements and Atoms: Basic Building Blocks
The Good Earth, Chapter 7: Rocks and Minerals
Minerals are made of elements• Some minerals (e.g., quartz) are composed of just
two elements
• Others (e.g., amphibole) are made up of several elements
• Some elements occur more frequently than others
Elements and Atoms: Basic Building Blocks
The Good Earth, Chapter 7: Rocks and Minerals
Atom – smallest particle that retains the characteristics of an element
• Atoms are made up of protons, neutrons, and electrons
• Protons and neutrons in atomic nucleus
• Electrons in surrounding “cloud”
Elements and Atoms: Basic Building Blocks
The Good Earth, Chapter 7: Rocks and Minerals
Atom – smallest particle that retains the characteristics of an element
• Atomic number – the number of protons in the nucleus
• Each element has a different number of protons in the atomic nucleus
• Example: Neon has 10 protons, Helium has 2 protons
Elements and Atoms: Basic Building Blocks
The Good Earth, Chapter 7: Rocks and Minerals
Atoms may have negative or positive charge if they gain or lose electrons
• Ions – atoms with different numbers of protons (positive) and electrons (negative)
− Silicon may lose 4 electrons +4 (positive charge, Si4+)
− Oxygen can gain two electrons to fill vacant sites
− 8 protons, 10 electrons -2 (negative charge, O2-)
Rocks and Minerals Checkpoint 7.1
The Good Earth, Chapter 7: Rocks and Minerals
Elements and Atoms: Basic Building Blocks
The Good Earth, Chapter 7: Rocks and Minerals
Elements bond together to form minerals
• Ionic bonds – balance of negative and positive charges of different ions (e.g., rock salt)
• Covalent bonds – sharing of electrons between elements (e.g., diamond) to achieve a stable atomic structure
Elements and Atoms: Basic Building Blocks
The Good Earth, Chapter 7: Rocks and Minerals
• Ionic bonds – balance of negative and positive charges
Sodium atom loses extra electron to yield a positive charge (Na+)
Chlorine ion gains extra electron to produce a negative charge (Cl-)
Elements and Atoms: Basic Building Blocks
The Good Earth, Chapter 7: Rocks and Minerals
Ionic bonds – balance of negative and positive charges
• Sodium and chlorine bond together to form rock salt (halite)
− Ionic bond – balance of positive sodium ions with negative chlorine ions (NaCl)
Elements and Atoms: Basic Building Blocks
The Good Earth, Chapter 7: Rocks and Minerals
Covalent bonds – sharing of electrons between elements
• Hydrogen and oxygen bond together to form water (H2O)
− Covalent bond – sharing of electrons between atoms ions
Elements and Atoms: Basic Building Blocks
The Good Earth, Chapter 7: Rocks and Minerals
Multiple bonds – silicon and oxygen join together by a combination of ionic and covalent bonding
• 4 oxygen and one silicon atom combine by covalent bonds to form a silica tetrahedron (SiO4)
− Tetrahedron has a negative charge (4-) and forms ionic bonds with atoms of other elements
Elements and Atoms: Basic Building Blocks
The Good Earth, Chapter 7: Rocks and Minerals
Silicate minerals – contain both silicon and oxygen
• Silicon and oxygen are most common elements in crust
• Silicates are the most common mineral group
− Examples: quartz, feldspar, mica, amphibole
Elements and Atoms: Basic Building Blocks
The Good Earth, Chapter 7: Rocks and Minerals
Different types of bonds result in minerals of different strengths
• Type of bonds determine strength of minerals, rocks
− Ionic bonds – Velcro analogy, weaker bonds
− Covalent bonds – Rope analogy, stronger bonds
• Minerals formed with covalent bonds are stronger and more resistant to destructive forces at Earth’s surface
− Silicates form more resistant rocks than most other mineral groups
Elements and Atoms: Basic Building Blocks
The Good Earth, Chapter 7: Rocks and Minerals
Silica tetrahedra combine together in different patterns in different silicate minerals
• Minerals with low silica content have simple structures
− Olivine, amphibole
• Minerals with high silica content have more complex structures
− Quartz, feldspar
Rocks and Minerals Conceptest
Which of the following mineral formulae represents a silicate?
A. FeS2
B. KAlSi3O8
C. Fe2O3
D. CaSO4•2H2O
The Good Earth, Chapter 7: Rocks and Minerals
Rocks and Minerals Conceptest
The total electrical charges of the ions of the elements in the mineral olivine must balance. From the data in Table 7.1, which is the most reasonable formula for the mineral?
A. MgSiO2
B. MgSiO4
C. Mg2SiO4
D. Mg4SiO2
The Good Earth, Chapter 7: Rocks and Minerals
Go back to the Table of Contents
Go to the next section: Minerals
The Good Earth, Chapter 7: Rocks and Minerals
Minerals
The Good Earth, Chapter 7: Rocks and Minerals
• Minerals: Naturally occurring, inorganic solids of one or more elements that have a definite chemical composition with an orderly internal arrangement of atoms
Quartz Muscovite Mica Orthoclase Feldspar
Galena Iron Pyrite Halite
Minerals
The Good Earth, Chapter 7: Rocks and Minerals
Mineral Characteristics• Crystal form – the
arrangement of the faces of a crystal to form a particular shape
− Common shapes arePrismsPyramidsNeedlesCubesSheets
Pyramids of calcite
Needles of tourmaline
Minerals
The Good Earth, Chapter 7: Rocks and Minerals
Mineral Characteristics• Cleavage – minerals
break along planes of weakness defined by atomic structure
− Cleavage planes more likely to occur across weak bonds between ions
− Example: mica forms sheets joined by weak ionic bonds
Mica 1 set of cleavage planes
Minerals
The Good Earth, Chapter 7: Rocks and Minerals
Mineral Characteristics• Cleavage – minerals
break along planes of weakness defined by atomic structure
− Example: feldspar has 2 cleavage planes that intersect at 90 degrees
− Example: amphibole has 2 cleavage planes that are not at 90 degrees to each other
Amphibole 2 sets of cleavage planes
Feldspar 2 sets of cleavage planes
Rocks and Minerals Checkpoint 7.7
The Good Earth, Chapter 7: Rocks and Minerals
Minerals
The Good Earth, Chapter 7: Rocks and Minerals
Mineral Characteristics• Hardness – minerals
ranked by their relative hardness using Mohs Hardness Scale
− Harder minerals can scratch softer minerals
− Softer minerals more likely to break down at Earth’s surface
− More resistant minerals more likely to be preserved (e.g., quartz sand on beaches)
Minerals
The Good Earth, Chapter 7: Rocks and Minerals
Mineral Characteristics• Color – minerals have
characteristic colors
− Dark minerals (black, brown, dark green) Olivine, amphibole,
pyroxene, biotite mica
− Light minerals (white, gray, pink) Quartz, feldspar,
muscovite mica, calcite
− Careful, some minerals have many colors
Minerals
The Good Earth, Chapter 7: Rocks and Minerals
Mineral Characteristics• Other – luster, streak
− Streak – color of mark on unglazed porcelain
− Example: brown streak of hematite (iron mineral)
− Luster: how light reflects from mineral
− Example: metallic luster of iron pyrite
The Good Earth, Chapter 7: Rocks and Minerals
Atoms to rocks: How they fit together
Fill in the concept map to assess your understanding of minerals
Go back to the Table of Contents
Go to the next section: Igneous Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Igneous Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Igneous Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Two types of igneous rocks are classified based on texture and composition
The same magma can form both rock types
1. Volcanic rocks – form when magma rises to Earth's surface• Produces
volcanoes, lava flows, tephra
• Molten rock cools rapidly
Igneous Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Two types of igneous rocks are classified based on texture and composition
The same magma can form both rock types
2. Plutonic rocks – form when magma solidifies below Earth's surface• Produces plutons
that remain hidden until exposed by erosion
• Molten rock cools slowly
Examples of PlutonsBatholith, stock, sill, dike, laccolith
Igneous Rocks
The Good Earth, Chapter 7: Rocks and Minerals
• On the basis of observations only, how could you classify these objects into different groups?
Examine these objects
Igneous Rocks
The Good Earth, Chapter 7: Rocks and Minerals
• Size• Color• Shape• Materials• Orientation• Other?
These objects could be classified on the basis of their:
We can classify igneous rocks using similar features
Igneous Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Texture• Size of crystals of
minerals in igneous rocks depends on rate of cooling of magma− Rapid cooling produces
microscopic crystals
− Slow cooling produces large, visible crystals
• Crystal size interpreted to learn where rocks formed
Slow cooling in plutonic rocks
Rapid cooling in volcanic rocks
Igneous Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Color• Color varies with
silica content (composition)− Silica-rich minerals
such as quartz and feldspar are light-colored
− Silica-poor minerals such as amphibole, biotite mica are dark colored
High silica Intermediate silica Low silica
Igneous Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Igneous Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Silica-rich rocks are composed mainly of minerals quartz and feldspar
Silica-poor rocks are composed mainly of feldspar with iron and magnesium rich minerals (e.g. amphibole, pyroxene, olivine)
Rocks and Minerals Conceptest
Geologists sometimes find a type of igneous rock known as porphyry, which contains both large and small crystals. Which is the best explanation for the formation of this rock? The rock experienced a two-stage cooling process . .
A. . . with initial slow cooling at depth followed by rapid cooling at the surface.
B. . . with initial rapid cooling at depth followed by slow cooling at the surface.
C. . . with initial rapid cooling near the surface followed by slow cooling at depth.
D. . . with initial slow cooling near the surface followed by rapid cooling at depth.
The Good Earth, Chapter 7: Rocks and Minerals
Rocks and Minerals Conceptest
This rock sample corresponds to . . .
A. A low silica volcanic rock.
B. A low silica plutonic rock.
C. A high silica plutonic rock.
D. A high silica volcanic rock.
The Good Earth, Chapter 7: Rocks and Minerals
Igneous Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Rock Types and Magma Types
3 Magma Types• Basaltic magma –
partial melting parts of asthenosphere
• Andesitic magma – partial melting of mantle rocks (with water)
• Rhyolitic magma - melting of parts of continental crust
Each magma type may produce two rocks – one volcanic, one plutonic
13
2
Igneous Rocks
The Good Earth, Chapter 7: Rocks and Minerals
• More viscous, high silica magma likely to cool below surface to form plutonic igneous rocks (e.g., granite)
Rock Types and Magma Types
• Less viscous, low silica magma likely to reach surface to form volcanic igneous rocks (e.g., basalt)
Granite batholiths, Sierra Nevada Mountains, California
Basalt lava, Hawaii
Rocks and Minerals Checkpoint 7.10
Name these igneous rocks and explain the reasons for your choices.
A B
DC
The Good Earth, Chapter 7: Rocks and Minerals
Rocks and Minerals Checkpoint 7.11
Complete the table by identifying which of the characteristics are present in volcanic and/ or plutonic igneous rocks.
The Good Earth, Chapter 7: Rocks and Minerals
Crystallization of silicate minerals from magma.
The Good Earth, Chapter 7: Rocks and Minerals
Rocks and Minerals
Checkpoint 7.12Finish the partially filed in concept map for igneous rocks by filling in the blanks with appropriate terms. Three of the terms are magma, basalt and plutonic rocks.
The Good Earth, Chapter 7: Rocks and Minerals
Go back to the Table of Contents
Go to the next section: Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Sedimentary rocks form as horizontal layers (beds)− identified based on composition, thickness− oldest beds at bottom, youngest at top
Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Three types of sedimentary rocks • Clastic, Chemical, Biochemical
− Identified by materials that make up the rock and/or the process by which they formed
Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
• Composed of rock and mineral fragments
− Most common type of sedimentary rock
Clastic Sedimentary Rocks
• 3 stages of formation− Generation
− Transportation
− Lithification
Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
1. Generation− Physical and chemical
breakdown of any rock at Earth’s surface (weathering) to form sediment
− Sediment = rock and mineral fragments
− Sediment classified by grain size Clay Silt Sand Gravel
Clastic Sedimentary Rocks
Increasing grain size
Sediment generated by weathering of Himalayas and transported in rivers
Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
2. Transportation− Erosion Sediment
moved from place of origin by streams, wind, glaciers
− Size of transported grains depends on velocity of transport medium
− Erosion produces characteristic landscapes
Clastic Sedimentary Rocks
Sediment (dust) transported by prevailing winds from Africa toward the Atlantic Ocean
Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
3. Lithification− Sediment deposited when
velocity of transport medium decreases
− Larger grain sizes deposited first, finest grains remain in suspension and are deposited last
− Over time, sediment is slowly compacted and grains are cemented together to form a new rock (lithification)
Clastic Sedimentary Rocks
Deposited sediment of contrasting grain sizes.
Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Clastic Sediment and Clastic Sedimentary Rocks− Rock names reflect grain size
Mudstone, Shale made of clay, silt-sized grains Sandstone composed of sand-sized particles Conglomerate made of gravel and larger fragments
Sandstone composed of quartz grains of similar sizes.
Conglomerate composed of gravel-sized rock fragments
Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Clastic Sediment and Clastic Sedimentary Rocks− Rock names reflect grain size (see Table 7.5)− Transportation process sorts grains so deposits may have
characteristic grain size (e.g., sand on a beach)
Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Clastic Sediment and Clastic Sedimentary Rocks• Transportation process sorts grains so deposits
may have characteristic grain size (e.g., sand on a beach)
• Sedimentary rocks hold clues to the environment where they were formed:− Example: river channels
High velocity flow in floods - gravels (conglomerate) Moderate speed flow – sand (sandstone) Slow flow - muds (shale)
Rocks and Minerals Conceptest
Examine the diagram. Weathering, transportation, and deposition can occur during steps:
The Good Earth, Chapter 7: Rocks and Minerals
A. 1, 2, 3
B. 3, 5, 7
C. 2, 4, 8
D. 4, 5, 6
1
2
3
4
5
6
7
8
Rocks and Minerals Checkpoint 7.14What observations can you make about the grain size and arrangement of these clastic sediments that would help determine their origin?
The Good Earth, Chapter 7: Rocks and Minerals
Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
• Form when minerals precipitate (crystallize) from a solution as a result of changing physical conditions− Solutions = fresh
water in lakes, groundwater or seawater
− Changing conditions commonly = increased temperatures (evaporation)
Chemical Sedimentary Rocks
Salt deposited on floor of ancient Lake Bonneville, Utah
Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
• Can be readily dissolved in water and transported to oceans
• Rocks are typically indicative of shallow, coastal marine conditions in geologic past− Termed evaporites
as most form by precipitation due to evaporation
Chemical Sedimentary Rocks
Salt deposited on floor of ancient Lake Bonneville, Utah
Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
• Link the biosphere and geosphere
• Form due to actions of living organisms that cause minerals to be extracted from solution
OR
• From the remains of dead organisms
Biochemical Sedimentary Rocks
Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
• Form due to actions of living organisms that cause minerals to be extracted from solution− The mineral calcite
is present in the rock limestone formed by coral organisms that build tropical reefs
Biochemical Sedimentary Rocks
Coral reef formed in shallow, tropical sea
Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
• May form from the remains of dead organisms− Coquina limestone
formed from broken shell fragments
− Coal carbon-rich rock formed from compacted plant remains
Coal seam, Wyoming
Coquina
Biochemical Sedimentary Rocks
Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
• May form from the remains of dead organisms− Chalk formed from
billions of coccoliths, round plates of calcite from microscopic (clay-sized) coccolithophore organisms
− Chalk is a type of limestone
Biochemical Sedimentary Rocks
Sedimentary Rocks
The Good Earth, Chapter 7: Rocks and Minerals
• May form from the remains of dead organisms− Coccolithophores live
in cold oceans
− Reflect sunlight to change water color
− Chalk indicates specific marine conditions in geologic past
Biochemical Sedimentary Rocks
Rocks and Minerals Checkpoint 7.15
Use the Venn diagram to compare and contrast chemical and biochemical sedimentary rocks. Identify at least seven characteristics.
The Good Earth, Chapter 7: Rocks and Minerals
Sedimentary Rocks and Fossil Fuels
The Good Earth, Chapter 7: Rocks and Minerals
− Form from buried organic-rich sediments.
− Chemical reactions convert organics with increased pressures and temperatures of 50-100 ºC.
− Over time (Myrs), oil and gas can form.
− Oil and gas may be trapped to form hydrocarbon reservoirs.
World is heavily dependant on oil and natural gas
Sedimentary Rocks and Coal
The Good Earth, Chapter 7: Rocks and Minerals
− Form from buried plants.
− Coal type (rank) depends on organic content of parent material, burial depth and heat.
− Over time (Myrs), coal can form.
− Lignite (low grade); bituminous (medium); anthracite (high).
US has some of the largest coal reserves in the world.
Go back to the Table of Contents
Go to the next section: Metamorphic Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Metamorphic Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Metamorphic Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Metamorphism • Changes in mineral composition and texture
that can occur in any solid rock
• Changes due to increasing temperature and/or pressure and/or the presence of fluids.− Temperatures high enough to promote chemical
reactions but not high enough to cause melting Approximately 200oC 1100oC, depending on rock
type and conditions Similar temperatures found deep in crust or near
magma chambers
Metamorphic Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Two types of metamorphism1. Contact metamorphism• Changes due to
increases in temperature where rocks come in contact with heat source (e.g. magma chamber)− Example: limestone
around a magma chamber is baked by the heat to form marble
Marble (above) and limestone have similar composition but marble typically has a larger grain size
Metamorphic Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Two types of metamorphism2. Regional metamorphism
Foliation is produced when tabular minerals grow perpendicular to the direction of pressure.
• Increased heat and pressure associated with associated with plate tectonic processes that form mountains− Increased pressures and
temperatures cause tabular minerals to take on a preferred orientation, foliation, perpendicular to direction of pressure
Metamorphic Rocks
The Good Earth, Chapter 7: Rocks and Minerals
foliation
Unmetamorphosed, non-foliated original rock (granite) with random distribution of minerals
Metamorphic rock (gneiss) with foliation illustrates parallel alignment of minerals
Increased pressures and temperatures cause tabular minerals to take on a preferred orientation, foliation, perpendicular to direction of pressure
Metamorphic Rocks
The Good Earth, Chapter 7: Rocks and Minerals
Two types of metamorphism
2. Regional metamorphism• Higher temperatures and
pressures yield more intense metamorphism
− Grain size increases with degree of metamorphism (metamorphic grade)
− Rock names vary with grain size
Rocks and Minerals Conceptest
The Good Earth, Chapter 7: Rocks and Minerals
The conversion from bread to toast can be seen as an analog for the formation of a metamorphic rock by:
A.Contact metamorphism
B.Regional metamorphism
Rocks and Minerals Checkpoint 7.18
Complete the table by identifying which of the characteristics are present in rocks formed by contact and/or regional metamorphism.
The Good Earth, Chapter 7: Rocks and Minerals
Contact versus Regional Metamorphic Rocks Checkpoint 7.19
Use the Venn diagram to compare and contrast metamorphic rocks formed by contact and regional processes. Add at least eight items to the diagram.
The Good Earth, Chapter 7: Rocks and Minerals
Go back to the Table of Contents
Go to the next section: Rock Cycle and Mineral Resources
The Good Earth, Chapter 7: Rocks and Minerals
The Rock Cycle and Mineral Resources
The Good Earth, Chapter 7: Rocks and Minerals
• Rock cycle links igneous, sedimentary, and metamorphic rocks together. − Any rock can become any other rock under
the appropriate conditions.
Rocks and Minerals Conceptest
The Good Earth, Chapter 7: Rocks and Minerals
Cooking an egg could be seen as an analog for the formation of :
A. Igneous rock.
B. Sedimentary rock.
C. Metamorphic rock.
Rocks and Minerals Conceptest
The Good Earth, Chapter 7: Rocks and Minerals
Concrete is formed by adding cement and water to a mixture of sand and gravel. This could be seen as an analog for the formation of what type of sedimentary rock?
A. Clastic rock.
B. Chemical rock.
C. Biochemical rock.
Rocks and Minerals Checkpoint 7.22
The diagram illustrates the rock cycle. Match the letters below to the blank ovals on the diagram. (Note: some letters are used more than once.)
A. Cementation and compaction (lithification)B. Heat and PressureC. Weathering, transportation, depositionD. Cooling and solidificationE. Melting
The Good Earth, Chapter 7: Rocks and Minerals
Mineral Resources
The Good Earth, Chapter 7: Rocks and Minerals
• Mineral resources result from specific geologic processes associated with formation of rocks. − Can result from chemical reactions driven by changing
temperatures and movement of fluids through rocks.
Mineral Resources
The Good Earth, Chapter 7: Rocks and Minerals
• Mineral resources result from specific geologic processes associated with formation of rocks. − Can result when minerals crystallize at different temperatures.
platinum
Mineral Resources
The Good Earth, Chapter 7: Rocks and Minerals
• Mineral resources result from specific geologic processes associated with formation of rocks. − Can result from concentration of various types of rocks and
minerals during erosion, transportation and deposition.
View of the Stullwater Mine, Nye, MT where rocks are collected for making lunar regolith simulant.
Credit: U.S. Geological SurveyDepartment of the Interior/USGSU.S. Geological Survey/photo.
Rocks and Minerals Concept Map
Complete the concept map to evaluate your understanding of the interactions between the earth system and rocks and minerals.
Label as many interactions as you can using information from this chapter.
The Good Earth, Chapter 7: Rocks and Minerals
The End
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The Good Earth, Chapter 7: Rocks and Minerals