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10 Cards in this Set
- Front
- Back
crust
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the thin outermost layer of the Earth
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continental crust
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very old crust (some as old as 4 billion years) and about 30 km. thick
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oceanic crust
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young crust (generally younger than 200 million years) and 5-10 km. thick
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mantle
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the zone of the Earth below the crust and above the core
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lithosphere
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the rigid, upper layer of the mantle that is solid
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asthenosphere
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the lower layer that is hot enough to flow slowly
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Global Positioning System (GPS)
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a satellite-based system for accurate location of points on the Earth (there are 24 of them, and each sends signals for 4 others)
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basalt
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a kind of volcanic igneous rock that makes up the ocean floor
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mid-ocean ridge
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a chain of undersea ridges extending through all of the Earth's ocean basins, and formed by sea-floor spreading
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offsets
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stiches in the mid-ocean ridge that are perpendicular to the axis of the ridge; point in the direction the plates are moving
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