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Chap1 Sec2
Changes within the Earth
Question | Answer |
---|---|
Core | The center of Earth. Consists of very hot metal that is dense and solid |
mantle | A thick layer of mostly solid rock beneath the earth's crust that surrounds the earth's core |
crust | The solid, rocky, surface layer of the earth |
relief | The differences in elevation, or height, of the landforms in any particular area |
plate tectonics | The theory that the earth's outer shell is composed of a number of large, unanchored plates, or slabs of rock, whose constant movement explains earthquakes and volcanic activity |
continental drift theory | The idea that continents slowly shift their positions due to movement of the tectonic plates on which they ride |
Pangaea | Hypothetical supercontinent that included all land masses of the Earth. |
San Andreas Fault | 750 mile fault line in California. The boundary of the North American Plate and the Pacific Plate. Source of many earthquakes. |
subduction | One plate slides or dives under another |
spreading | Two plates move apart from each other, creating a rift in the earth's crust |
converging | When two plates collide and push slowly against each other |
faulting | Plates grind or slide past each other, rather than collide |