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Ch7sec1
Earth layers
Term | Definition |
---|---|
Crust | Earth's solid, rocky surface containing the continents and ocean floor. |
Original Horizontally | The idea that many kinds of rocks form flat , horizontal layers. |
Continental drift | The idea that a supercontinent split apart into pieces, the continents, which drifted in time to their present locations. |
Sea-floor spreading | The idea that new crust is forming at ridges in the sea floor, spreading apart the crust on either side of the ridges. |
Magma | Hot, molten rock below Earth's surface. |
Plate Tectonics | The idea that Earth's surface is broken into plates that slide slowly across the mantle. |
mantle | The layer beneath Earth's crust. |
Subduction | the sliding of a denser ocean plate under another plate when they collide. |