click below
click below
Normal Size Small Size show me how
plate tectonics
alfred wegener, plate tectonics, and plate boundaries, and earths layers
Question | Answer |
---|---|
what is sea-floor spreading? | sea-floor spreading is a process that slowly adds new rock to the ocean floor. |
plate boundaries | where two plates meet |
transform boundary | two plates slip past each other in opposite directions (faults, earthquakes) |
divergent boundary | two plates move apart (midocean ridges, rift valleys) |
convergent boundary | two plates come together and collide (ocean trenches, mountains) |
pangea | the super continent in Wegener's theory of continential drift |
what causes plates to move? | circulating heat currents in the earth's mantle that cause the plates to move. |
the lithosphere | the earth's lithosphere is part of the mantle and the crust, made of solid rock, and is broken into separate sections. |
Wegener's landform evidence | wegener used mountian ranges and coal beds to prove his theory. |
Wegener's fossil evidence | Wegener used the plant fossils and the mesosuarus fossils to prove his theory. |
Wegener's climate evidence | Wegener used glacier stratches and found fossils of tropical platnts in antarctica to prove his theory. |