the lithosphere
DESCRIPTION
The Lithosphere. Ooooh ! Exciting . The Four Spheres. Strahler , A. and Strahler , A., 2005. Physical Geography . Wiley, NY. The Lithosphere. http://www.pbs.org/wnet/savageearth/animations/hellscrust/index.html The earth is composed of 3 parts The core The mantle The crust - PowerPoint PPT PresentationTRANSCRIPT
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The Lithosphere
Ooooh! Exciting
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The Four Spheres
Strahler, A. andStrahler, A., 2005.
Physical Geography.Wiley, NY.
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http://www.pbs.org/wnet/savageearth/animations/hellscrust/index.html
The earth is composed of 3 parts1. The core2. The mantle3. The crust
The Lithosphere is the hard shell of the earth consisting of the crust and the top most part of the mantle
The Lithosphere
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The Lithosphere
Parts of the earth
Similarities with an Apple
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The Lithosphere contains minerals and rocks that we use for buildings, metals and jewellery.
The Lithosphere
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Minerals are inorganic ( they do not originate from neither plants nor animals)
Minerals must exist naturally on earth; they cannot be manufactured
Minerals have a clearly ordered structure Minerals are distinct in their chemical
composition Some minerals are made up of one element ex:
gold (Au), copper (Cu) Some minerals are made up of 2 or more elements
bonded together ex: Quartz (Si O2)
Minerals
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Classification – Color and Transparency Idiochromatic minerals are minerals that
have a characteristic colour. The element that gives them their colour is part of their chemical composition
Minerals that vary in color are allochromatic
Minerals can allow light to pass through, some straight through= transparent.
Some let some light through= translucent Allowing no rays of light through= opaque
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Hardness Hardness depends on the strength of the
atomic bonds in the minerals Mohs scale assigns a value from 1-10 to
indicate its hardness
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Streak When rubbed minerals leave a trace of
powder
The color may be different from that of the mineral
Idiochromatic leave bright colored powder
Allochromatic leave a white/pale powder
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There are three main types of rocks:
http://www.youtube.com/watch?v=Aqy-p41VpKU&feature=related
1. Igneous - formed when molten rock cools.
2. Sedimentary – formed by the “cementing together” of small grains of sediment.
3. Metamorphic – rocks changed by the effect of heat and pressure.
Types of Rocks
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These are rocks formed by the cooling of molten rock (magma.)
magma
volcanoMagma cools and solidifies forming igneous rocks
Igneous Rocks
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Igneous Rocks There are 2 types of Igneous rock
1) Extrusive Igneous Rocks: Rock forming from Magma upon contact with air
2) Intrusive Igneous Rocks: Rock forming from Magma before reaching the surface of the earth
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Sedimentary Rocks Sedimentary Rocks are rocks
formed when particles of sediment build up and are “cemented together” by the effect of pressure and minerals.
sea
Fragments washed to the sea
Sedimentary rocks
Rocks are brokenup by the actionof weather
Gettin
g o
lder
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Metamorphic Rocks Metamorphic rocks are formed by the
effect of heat and pressure on existing rocks.
This can greatly affect the hardness, texture or layer patterns of the rocks.
Magma
metamorphicrock
forminghere
heat
Pressure from surface rocks
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Uses of Rocks
Rock Type Possible Uses
Granite Intrusive Igneous Ornamental Stone (Kitchen)
Diorite Intrusive Igneous Ornamental Stone
Pumice Extrusive Igneous Light building materials, cosmetic industry
Basalt Extrusive Igneous Insulation, floor tiles
Sandstone Sedimentary Building materials
Limestone Sedimentary Cement, building materials
Gneiss Metamorphic Building materials
Marble Metamorphic Interior design
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How Granite is made?http://www.youtube.com/watch?v=z66fR9p4Lgc
How curling stones are made http://www.youtube.com/watch?v=nxrt3fjp4t0
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Soil
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Soil Soil is from parent rock
It takes 200 years to form a layer of soil...1cm thick!
Soil forms distinct layers over time.
Layers can be distinguished by color, texture and composition
The layers are called HORIZONS
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O horizon – Organic Matter Topmost layer High % of dead organic matter.
Ie: leaves, stems, fruits, seeds, pine needles Formed from decomposition
of organic matter. (humus)
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A horizon - Topsoil Seeds germinate and plant roots grow in this
dark-colored layer. It is made up of humus (decomposed organic
matter) mixed with mineral particles. Mixture of soil from below
and the humus above.
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B horizon - Subsoil Trees with deep roots draw nutrients from
this layer It is made up mostly of sand and silt,
having lost most of its minerals and clay as water drips through the soil.
Leached from layers above Clay and many minerals
Iron Aluminum Calcium
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C horizon – Fragmented Parent Rock Can be saturated in groundwater Formed through the disintegration of the
underlying parent rock. It consists of slightly broken-up bedrock.
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R Horizon – Unaltered Parent Rock Plant roots do not penetrate into this layer.
Starting point for soil formation
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Soil Conditions Three conditions must be met for soil to be
suitable for plant life to form: Water soluble nutrients Adequate moisture Appropriate soil pH
Soil to acidic or alkaline jeopardizes the transfer of mineral nutrients
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Permafrost Ground whose temperature has been 0o or
lower for at least two years.
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Permafrost The upper layer thaws in the summer and
some growing occurs, this layer is the active layer
Permafrost makes construction difficult and agriculture nearly impossible
Inuit people build their homes on piles that pass through the active layer and sit directly on the permafrost
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Texture and pH
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Soil Texture
Soil texture is the single most
important physical property of the
soil. Knowing the soil texture alone
will provide information about: 1) water flow potential,
2) water holding capacity,
3) fertility potential,
4) suitability for many urban
uses like bearing capacity
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To determine texture The Percent of sand,
silt, clay in a soil sample
Critical for understanding soil behavior and management
Soil texture is not subject to change in the field but can be changed in potting mixes.
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Buffering Capacity pH is measured on a scale of 0 (very acidic)-
14(very alkaline) Soil should ideally be between 6-7 to allow for
maximum nutrient absorption Soil has the ability to resist pH changes, when
acidic or alkaline compounds are added this is it`s BUFFERING CAPACITY
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Energy Resources in the Lithosphere
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Energy Resources in The Lithosphere The lithosphere contains energy resources
Oil Natural Gas Coal
Thanks to these resources, we can heat buildings, power factories and car engines
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Fossil Fuels
2/3 of the world’s energy is is produced from fossil fuels (oil, natural gas and coal)
http://www.brainpop.com/science/ourfragileenvironment/fossilfuels/
http://videos.howstuffworks.com/hsw/6187-energy-what-are-fossil-fuels-video.htm
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Formation of Oil & Natural Gas
•Oil comes from Small Marine Mammals and algae
•Organisms sink to the bottom where they are covered in sand, rocks and minerals
•Due to the pressure the sediment is turned into oil
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Formation of Coal
•Oil comes from plants and trees that once grew in swamps•Over time these swamps were buried under sand and rock•The organic residue was compressed and it turned into coal•Coal is a solid
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Fossil Fuels When fossil fuels burn they give off by-
products like carbon dioxide Carbon dioxide is the main greenhouse gas
behind global warming Sulfur dioxide and nitrogen oxide are also by-
products of the combustion of fossil fuels and cause acid rain
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Energy Resources: Uranium Uranium is a radioactive element that is found
naturally in the earth’s crust By splitting the nucleus of the Uranium atom
energy is produced called NUCLEAR ENERGY
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Pros to Nuclear Energy Little waste produced A lot of energy can be produced with very
little uranium
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Cons to Nuclear Energy No where to store it It’s radioactive (waste)... That it can alter DNA
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Energy Resources: Geothermic• Molten Rock is found beneath the Earth’s crust
which contains lots of energy• Geothermal Energy is the energy that comes from
the internal heat of the earth.
http://www.youtube.com/watch?v=-ajqiPe_9Ko&feature=related
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How does it work? Series of pipes under
house Heat absorbing liquid
in pipes When it’s cold in the
air, heat will be transported to house from pipes (underground)
When it’s hot in the house, heat will be transported to the pipes
http://www.youtube.com/watch?v=-ajqiPe_9Ko&feature=related
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Geothermal Pros and Cons Pros
Reduce heating costs Reduce CO 2 emissions Renewable energy
source
Cons Expensive