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Unit 3 vocab,Alex C
Plate Tectonics
| Term | Definition |
|---|---|
| Asthenosphere | the upper layer of the earth's mantle that's under the lithosphere |
| Subduction | two plates colliding then the denser plate descends below the less dense plate |
| Seafloor spreading | theory that explains how new oceanic crust is formed at ocean ridges |
| Mantle convection | |
| Ridge Push | the weight of the uplifted ridge to push the oceanic plate toward the trench formed at the subduction zone |
| Slab pull | the weight of the relatively cool dense subtucting plate pulls the trailing slab into the subduction |
| Lava | magma that flows out the earth's surface |
| Magma | molten rock below the earth's surface |
| Tectonic plate | huge pieces of crust and the upper mantle that fit tpgether to cover earth's surface |
| Theory of continental drift | theory that states earth's continents have been joined as a single land mass to make supercontinent named pangea |
| Convergent boundary | regions where two tectonic plates moving toward each other |
| Divergent boundary | regions where two tectonic plates are moving apart |
| Hot spot | hot regions or earth's mantle where hot plumes of magma rises to the surface |
| Epicenter | point of earth's surface directly above the focus |
| Focus | point of failure where the waves of the earthquake originate from |
| Pangea | all of earth's continents together forming a single land mass making a super continent |
| Geohazard | geological condition that could lead to damage or risk of injury's like earthquakes |
| Reverse fault | horizontal and vertical compressions that squeezes rock and shortens the crust |
| Strike-slip fault | shear causes horizontal movement along a fault plane like the san andreas fault |
| Normal fault | fracture or systme of fractures along earth's tectonic plates when they move |
| Compression | stress that decreases the volume of a material |
| Tension | stress that pulls a material apart |
| Shearing | stress that causes a material to twist |
| Felsic | igneous rock realative to a group of light-colored minerals or rocks |
| Mafic | igneous rock realative to a group of dark colored minerals or rocks |