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Earth’s Structure The egg that you live on
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Parts of the earth Hydrosphere- water makes up about 70% of the earth’s surface. Lithosphere- the earth’s rocky, outermost layer.
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Parts of the Earth Atmosphere- the layer of gases surrounding the earth. Biosphere- the area on or near the earth’s surface that supports plant & animal life.
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Earth’s Structure Core- mostly iron & nickel.
Mantle- a layer of semi-solid rock around the core; 1800 miles thick. Crust- thin, rocky surface layer; 4 to 45 miles thick.
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Convection Currents The heating & cooling of the mantle that causes the crust to move. Internal force responsible for building new landforms.
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Plate Tectonics The theory that the earth’s outer shell is not one solid piece of rock but is broken into a number of moving plates.
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Continental Drift The theory that the continents were once part of one large landmass & moved to their present positions after millions of years.
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