Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Drift and Tectonics
Land Beneath Our Feet #2
| Term | Definition |
|---|---|
| continental drift | Wegner's theory that Earth's continents were once joined in a single landmass and gradually moved apart |
| Pangaea | Wegner's name for the supercontinent |
| mid-ocean ridge | underwater mountain ranges |
| convection | energy transfer by the movement of a material |
| convection currents | sinking and rising motion that occurs through the transfer of heat energy |
| theory of plate tectonics | theory that states that Earth's lithosphere is made up of huge plates that move over the surface of the Earth |
| divergent boundary | occurs where plates move/pull apart |
| convergent boundary | occurs where plates move/push together |
| transform boundary | occurs where plates scrape/slide by one another |
| rift valley | happens where ridges continue to widen and create a gap and molten material rises to build new crust |
| magnetic reversal | where the North and South Poles switch position |
| hot spots | where heated rock rises in plumes or thin columns from the mantle |
| subduction | one plate sinks beneath another |
| continental-continental collision | 2 continental plates carrying continental crust push together forming mountains |
| oceanic-oceanic subduction | 2 oceanic plates come together as one sinks beneath the other due to density (forms ocean trenches and island arcs) |
| oceanic-continental subduction | when oceanic crust sinks under continental crust (forms deep ocean trenches and coastal mountains) |
Created by:
Ms. Long 6
Popular Science sets