3 Written questions
3 Multiple choice questions
- the process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle
- a process that continually adds new material to the ocean floor
- 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.
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.
mid-ocean ridge → deep underwater canyons