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Earth's Structure
Earth's History and Structure
| Term | Definition |
|---|---|
| Crust | The thin and solid outermost layer of the Earth above the mantle. |
| Mantle | The layer of hot, solid material between Earth's crust and core. |
| Core | The central part of the earth below the mantle. |
| Convection Currents | Circular currents in the mantle caused by the magma being heated by the core off the Earth. |
| Law of Superposition | The geologic principle that states that in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it. |
| Geologic time scale | A record of the geologic events and life forms in Earth's history. |
| Pangaea | The name of the single landmass that broke apart 200 million years ago and gave rise to today's continents. |
| Continental Drift Theory | The idea that continents slowly shift their positions due to movement of the tectonic plates on which they ride |
| Convergent Boundary | A tectonic plate boundary where two plates collide, come together, or crash into each other. |
| Divergent Boundary | A plate boundary where two plates move away from each other. |
| Transform (sliding) boundary | a place where two plates slip past each other, moving in opposite directions |
| mid-ocean ridge | An undersea mountain chain where new ocean floor is produced; a divergent plate boundary. |
| rift valley | A deep valley that forms where two plates move apart |
| Volcanic Arc (Island Arc) | a chain of volcanoes formed above a subducting plate, positioned in an arc shape |
| subduction zone | The region where oceanic plates sink below continental plates. |
Created by:
eoconnor
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