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Unit 3
Plate Tectonics
| Term | Definition |
|---|---|
| asthenosphere | the mantle directly under the lithosphere |
| Subduction | when one tectonic plate goes under another one |
| Seafloor spreading | when the ridges open up and push the other ridges away from the middle |
| Mantle convection | when the hot less dense part of the mantle rises, and cools on the way up, and when it cools it begins to sink back down in an infinite cycle which is one of the most powerful forces moving the lithosphere |
| Ridge push | when magma pushes up and forces the plate tectonics away from each other in opposite directions |
| Slab pull | pulling a tectonic plate into the mantle at a subduction zone |
| Lava | molten rock thats gone above the earth and onto the surface |
| Magma | molten rock under the ground and has not reached the surface |
| Tectonic Plates | earths crust broken up in uneven chunks around the globe |
| Theory of continental drift | The theory that the continents used to all be one super continent, until they were forced apart and drifted around the world to where they are now, and are still in motion. The Theory was by Wegner |
| Convergent boundary | when two tectonic plates collide into each other |
| Divergent boundary | when two plate move away from each other |
| Transform boundary | when two tectonic plates go past each other and slide against each other |
| Hot spot | an unusually hot area that will allow volcanoes to form in the middle of the tectonic plates |
| Epicenter | directly above the earthquakes focus point |
| Focus | the spot where the earth breaks from stress |
| Pangaea | A supercontinent made up of all the continents, that broke apart to make our earth now |
| Geohazard | A natural disaster in the lithosphere that can cause mass damage |
| Reverse fault | A convergent, compression that will cause an earthquake |
| Strike-slip fault | Shearing, transform boundary that causes an earthquake |
| Normal fault | A tension, divergent boundary that causes an earthquake |
| Compression | force that pushes rocks together |
| Tension | force that stretches rock in the middle |
| Shearing | when rocks are pushed are away from each other |
| Felsic | light coloured igneous rocks |
| Mafic | Igneous rocks with a lot of iron (dark coloured) |
Created by:
Kira D
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