| A | B |
|---|
| core | Earth's innermost structure |
| converging boundaries | fault where tectonic plates are pressing towards each other |
| earthquake | violent shaking of Earth's crust as built-up energy is released |
| diverging boundaries | fault where tectonic plates are pressing towards each other |
| fault | crack in Earth's surface along which movement takes place, also called plate boundaries |
| sliding boundaries | fault where tectonic plates slide in opposite directions and rocks grind against each other |
| Mid Atlantic Ridge | mountain in the middle of the Atlantic Ocean formed by divergent plate action |
| Pangea | landmass before continental drift |
| trench | ditchlike groove or channel created at plate boundaries |
| magma | melted rock below Earth's surface |
| mantle | thick layer of earth made of molten rock just under the crust |
| Tectonic plates | theory that giant places of crust are moving slowly across Earth's surface |
