| A | B |
|---|
| deep sea ocean basin | about 2 miles deep |
| deep sea ocean basin | filled with plains, mountains and trenches |
| mid ocean ridge | world's longest mountain range |
| mid ocean ridge | where seafloor is made |
| mid ocean ridge | most geologically active |
| continental shelf | submerged portion of the continent |
| solid inner core | very center of the earth |
| solid inner core | made of solid iron sphere |
| crust | thin brittle layer covering the earth |
| crust | broken into 12 plates |
| continental slope | steep slope that descends to ocean floor |
| liquid outer core | layer of earth between iinner core and mantle |
| liquid outer core | surrounds the inner core |
| seafloor spreading | new seafloor is made because of this |
| seafloor spreading | crustal plates move apart and magma moves into the gap |
| magma | hot molten rock in the mantle |
| lava | when the magma reaches the surface of a volcano, it is called this |
| hydrothermal vent | a geyser on the seafloor |
| hydrothermal vent | spews out superhot water full of minerals |
| hydrothermal vent | bacteria burn the minerals in the water from these for energy |
| subduction | one plate is forced underneath another |
| mantle | the layer of the earth under the crust |
| mantle | the crustal plates float on the ------ |
| mantle | moves like a conveyor belt |
| large mountains | formed when 2 land plates move together |
| earthquakes | formed with land and ocean plates slide past each other |
| volcanic islands | formed when 2 ocean plates move together |
| coastal volcanoes | made when land and ocean move toward each other |
| deep sea trench | made when ocean and land plates move toward each other |
| new ocean floor made | made when 2 ocean plates move away from each other |
| rift valley | 2 land plates move apart |
