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Unit 3 Vocab Katie R
Plate Tectonics
| Term | Definition |
|---|---|
| Asthenosphere | the upper layer of the earth's mantle, below the lithosphere, |
| Subduction | when 1 tectonic plates is forced under another |
| Seafloor Spreading | a hypothesis that there is a continuous cycle of crust forming by magma intrusion which causes ocean ridges to spread |
| Mantle Convection | when magma in the earths mantle moves in a circular motion |
| Ridge Push | when a ridge pushes an oceanic c plate toward a subduction zone |
| Slab Pull | when a subducting plate pulls the following part of the lithosphere into the subduction zone |
| Lava | molten rock outside of the earth's surface |
| Magma | molten rock in the earth's surface |
| Tectonic Plate | giant pieces of the earth's crust that covers the surface |
| Theory of Continental Drift | Wegner's hypothesis that all the continents used to be joined together and eventually broke apart and moved to where they are now. |
| Convergent Boundry | the point where two tectonic plates move toward each other |
| Divergent Boundry | the point where two tectonic plates move away from eachother |
| Transform Boundry | the point where two tectonic plate slide past each other |
| Hot Spot | an unusually hot area in the earth's mantle |
| Epicenter | the spot on the earth's surface right above the focus of an earthquake |
| Focus | the point where an earthquake originates |
| Pangea | a landmass 200 million years ago that consisted of all the continents |
| Geohazard | hazards that relate geologically that can cause much damage; examples are avalanches |
| Reverse Fault | horizontal compression |
| Strike Strip Fault | horizontal shear |
| Normal Fault | horizontal tension |
| Compression | being made smaller and denser |
| Tension | the process of stretching something out |
| Shearing | causes the material its applying pressure to twist and shred |
| Felsic | igneous rocks made of lighter elements |
| Mafic | igneous rocks made from darker elements |