3 Written questions
3 Multiple choice questions
- a process that continually adds new material to the ocean floor
- 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.
2 True/False questions
mid-ocean ridge → an undersea mountain chain that is part of a long system of mountains that winds beneath Earth's oceans.
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.