BBC Our Secret Universe: The Hidden ... - Low pH Productions
The longest chain of mountains in the world is the system of . mid-ocean ridges. In the mid-1900s, scientists mapped the mid-ocean ridges using. sonar. Sonar . is a device that bounces sound waves off underwater objects. and then records the echoes of these sound waves. The mid-ocean ridges. curve along the sea floor, extending into all of ... ................
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