click below
click below
Normal Size Small Size show me how
Science
Sea-floor spreading
Question | Answer |
---|---|
Sea floor spreading? | When molten material rises from mid-ocean ridges to create a new oceanic crust |
What happens to old oceanic crust as new molten material rises from the mantle? | Sinks into deep ocean trenches |
Subduction? | Molten material is hot, spreads then becomes cool, dense & sinks |
Sonar? | A device scientists use to map the ocean floor |
Mid-ocean ridge? | A chain of underwater mountains along which sea floor spreading occurs |
Divergent? | < > two plates carrying oceanic crust collide |
Convergent? | > < two plates carrying continental crust collide |
Transform? | ^ ¥ a plate carrying oceanic crust collides with a plate carrying continental crust |