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 |