Sea Floor Spreading Flashcards
A chain of mountains found underwater
ridge
A device that bounces sound waves to determine distance and location
sonar
When sonar was first used
World War II
Scientist responsible for discovering mid ocean ridges
Harry Hess
Sea floor spreading begins here
Crack at mid ocean ridge
Evidence that supports sea floor spreading
Pillow-like rocks cooling quickly
Where the ocean floor eventually sinks
Deep ocean trench
When ocean crust sinks under continental crust
Subduction
Where are older rocks on the ocean floor found
Furthest from the crack
How long does it take subduction to occur
Millions of years
True or false: Continental crust also undergoes subduction
True
Which crust has high density
Oceanic Crust
True or false: Subduction changes the size and shape of oceans
True
Which ocean is currently in the process of subduction
Pacific
What do rocks in the ocean floor contain?
Iron