| A | B |
|---|
| Pangaea | "All Lands", a supercontinent |
| Riffs | valleys |
| Ridges | underwater mountains |
| Seafloor spreading | newer crust at mid-ocean ridges |
| Seafloor spreading | older crust at plate boundaries |
| Lithosphere | divided into plantes which move |
| Asthenosphere | provides convection currents on which the plates move |
| the oldest seafloor | found near the trench |
| the youngest seafloor | found near the mid-ocean ridge |
| the warmest ocean water | found near the mid-ocean ridge |
| Mid-Atlantic Ridge | underwater ridge in the Mid-Atlantic Ocean |
| the lithosphere contains the | crust and upper mantle |
| the aethenosphere is the | soft putty-like layer of the mantle on wheich the lithospheric plates float |
| Plate tectonics | theory that entire plates move |
| Diverging boundary | plates move opposite direction |
| Sliding boundary | plates slide past each other |
| Converging boundary | plates move toward each other or collide |
| Sonor | technology that uses reflected sound to map the topography of the ocean floor |
| the plate in whcih we live | North American |
| convection currents | magma in the asthenosphere heats up and rises and then cools and sinks creating circular currents under the lithosphere |
| diverging plate boundaries are found at | mid-ocean ridges |
| converging plate boundaries produce | mountain ranges |
| Seafloor crust is made of basalt and is | more dense than the continental curst made of granite |
| the seafloor crust will subduct under the continental crust | example of a converging boundary |
| ocean and continent converging boundaries | may produce and/or contain volcanoes |
| ocean and ocean converging boundaries | may produce and/or contain an island arc |
| continent and continent converging boundaries | may produce and/or contain mountains |
| the mountain range formed between India and Asia because of continent and continent converging boundaries | Himalayan |
| Two major plates grinding past each other at the San Andreas Fault | North American and Pacific |
| example of a hot spot | the plate is moving over this area creating a series of islands |
