ch. 2 “a living planet”. ch. 2.1 “the earth inside and out”
TRANSCRIPT
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Ch. 2 “A Living Planet”
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Ch. 2.1 “The Earth Inside and Out”
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The Solar System
• Nine (Eight) planets and other celestial bodies that revolve around a sun
• Earth is 3rd planet
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Earth’s Structure
• Core: solid, very hot, made of iron and nickel
• Mantle: molten rock aka. magma
• Crust: made of tectonic plates
• Plates that rise above ocean waters form the 7 Continents
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Above Ground
• Atmosphere: layer of gases that surround earth
• Lithosphere: solid rock surface
• Hydrosphere: water elements
• Ecosphere/Biosphere: plants and animals
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“Continental Drift Theory”
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“Sea Floor Spreading”
• One of the causes continental drift.
• Occurs over millions of years
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Ch. 2.2 “Bodies of Water and Landforms”
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Oceans and Seas
• Oceans: interconnected body of salt water
• Covers 71% of planet• 3 basic motions:
– Current– Waves – Tides
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Lakes, Rivers, Streams
• Lakes:– Hold 95% of all fresh
water– Can be both fresh and
salt water (Great Salt Lake)
• Rivers and Streams feed water to oceans and lakes
• Drainage basin: area drained by rivers and streams
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“Hydrologic Cycle”
• Continuous circulation of water between the:
1. Oceans, Lakes
2. Atmosphere
3. Earth
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Ground Water
• Water that is held in pores of rock
• Water table– The level at which the
rock is saturated
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Landforms
• Naturally formed features on the earth
• 2 kinds:
1. Oceanic
2. Continental
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Oceanic Landforms
• Seafloor has same features except below water
• Continental Shelf: edge of continent to deep part of ocean
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Continental Landforms
• Relief: difference in elevation from lowest to highest point
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Ch. 2.3 “Internal Forces that shape the earth”
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Plate Tectonics
• Pieces of earths crust that float on magma• Interaction of plates is what shapes the earth
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Plate Boundaries
• Plate Boundaries: where plates come in contact with one another
– 3 Types1. Divergent
2. Convergent
3. Transform
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Divergent boundary
• plates move apart or spread
• Example is sea floor spreading
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Convergent Boundary
• Plates collide and either:1. Dive under
one another
2. Rip up• Fault: fracture in the
earths crustFig 2
Fig 1
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Transform boundary
• Plates slide past one another
• Earthquake: violent movement of plates
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Earthquakes
• Epicenter: surface mark of quakes beginning
• Richter scale: measures amount of energy released by an earthquake.
• Tsunami: giant wave
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Volcanoes
• Where magma (lava) pours out of earth onto the surface
• Ring of Fire: volcanic zone around the rim of Pacific Ocean
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Ch. 2.4 “External Forces Shaping the earth”
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Weathering
• The mechanical-(physical) and chemical process that changes earth
– Break down rock to form sediment
• 2 forms:
A. Mechanical B. Chemical
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Mechanical Weathering
• Process that breaks rock into smaller pieces
• Ice crystals, plant roots, drilling are all examples
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Chemical Weathering
• When rock is changed into new substance after reacting to air or water– Ex: iron rust
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Erosion
• The movement of weathered material• 3 Kinds:
A. Water B. Wind C. Glacier
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Water Erosion• Movement of material through the motion of
water flow through streams, rivers, ocean currents
-when a river enters the ocean, sediment is deposited in fan-like landforms called deltas
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Wind Erosion• Movement of
material through the wind
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Deposits• New landforms are
created by loess-– Wind-blown silt and
clay sediment that produces fertile soil.
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Glacial Erosion
• Glacier: large, long lasting mass of ice
• Glaciation: changing of landforms by slow moving glaciers – Ridges or hills formed
by glacial rocks are called a moraine.
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Building Soil
• Weathering and erosion are part of the process of “building soil”
• Soil is comprised of rock, humus, air, and water
• Humus: organic material