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objective 9
vocab
| Term | Definition |
|---|---|
| continental drift | hypothesis that continents are constantly in motion |
| mantle | middle layer of the earth |
| pangaea | ancient super contenent |
| mid ocean ridge | mid ocean ridge mountain located on the seafloor in the middle of the ocean |
| seafloor spreading | new oceanic crust forms at mid ocean ridge as old crust moves away |
| convection | circulation of materials caused by different tempetres and density |
| convergent plate boundary | where 2 plates collide |
| divergent plate boundary | where 2 plates seperate |
| lithosphere | cold rigid outmost rock layer of earth |
| plate techtonics | theory that the earth is made of rock plates that move and respect each other |
| subduction | sinking of a denser plate |
| transform plate boundary | where 2 plates slide |