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unit 3 vocab gianna
plate tectonics
| Term | Definition |
|---|---|
| Asthenosphere | upper layer of earths mantel |
| Subduction | when one plate undergoes a more dense one |
| Seafloor spreading | when a divergent boundary occurs and new seafloor is created |
| Mantle convection | causes the plates to move |
| Ridge push | sliding plate force acts as a driving force |
| slab pull | when a less dense plate undergoes more dense plate |
| lava | hot molten liquid that comes out of volcanoes |
| magma | hot liquid inside volcanoes and earth mantel |
| tectonic plate | a big slab of rock |
| Theory of continental drift | theory the continents have drifted over time |
| convergent | 2 plates moving together |
| divergent | 2 plates moving away from each other |
| transform | 2 plates sliding against each other |
| hot spot | a spot with raised tempature |
| epicenter | center of an earthquake |
| focus | right above |
| pangaea | the super continent |
| geohazard | a hazard that might cause damage to earth |
| reverse fault | one side moves up and over the other side |
| strike slip fault | shearing force occurs in a horizontal motion |
| normal fault | tension occurs in a vertical direction |
| compression | a type of stress where something is dense |
| tension | a type of stress when somethings tight |
| shearing | a type of stress when something breaks off |
| felsic | lightly colored minerals |
| mafic | dark colored minerals |