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unit3 vocab nathalia
plate tectonics
| Term | Definition |
|---|---|
| asthenosphere | this part of the earths layers is located above the mantle |
| subduction | when one plate slides under another |
| seafloor spreading | when new ocean crust is formed by a boundary |
| mantle convection | slow movement of the mantle caused by convection |
| ridge push | when plates slide |
| slab pull | a process involving convection currents |
| lava | magma that comes out of a volcano |
| magma | molten rock heated and compressed together |
| tectonic plates | massive pieces of rock |
| theory of continental drift | all the continents were once joined |
| convergent boundaries | when two plates run into each other |
| divergent boundaries | when two plates move apart |
| transform boundaries | when two plates slide against each other |
| hot spot | where the mantle has high temperatures |
| epicenter | where a seismic rupture starts |
| focus | where the part of the earth starts to break |
| pangaea | all the continents connected |
| geohazard | conditions around the earth that could spread |
| reverse fault | when a side of the fault moves up |
| stike-slip fault | displacement of the earths crust |
| normal fault | when the wall moves down |
| compression | when something is being compacted together |
| tension | the way a force reacts |
| shearing | pressure or force |
| felsic | association with igneous rocks, rich in elements |
| mafic | mineral in association with igneous rocks |