3 Written Questions
3 Multiple Choice Questions
- a device that bounces sound waves off underwater objects and then records the echoes of these sound waves.
- 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.
- the process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle
2 True/False Questions
sea-floor spreading → a process that continually adds new material to the ocean floor
mid-ocean ridge → an undersea mountain chain that is part of a long system of mountains that winds beneath Earth's oceans.