3 Written Questions
3 Multiple Choice Questions
- deep underwater canyons
- In a process taking tens of millions of years, part of the ocean floor sinks back into the mantle at deep-ocean trenches.
- the process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle
2 True/False Questions
What is the process of sea-floor spreading? → In sea-floor spreading, the sea floor spreads apart along both sides of a mid-ocean ridge as new crust is added. As a result, the ocean floors move like conveyor belts, carrying the continents along with them.
What is the evidence for sea-floor spreading? → Several types of evidence supported the theory of sea floor spreading: eruptions of molten material, magnetic stripes in the rock of the ocean floor, and the ages of the rocks themselves.