Answer:
The Earth's crust is broken up into a series of massive sections called plates. These tectonic plates rest upon the convecting mantle, which causes them to move.
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Also influenced by elevation and altitude
Scientific ocean exploration began in the 19th century, using wooden sailing ships. At that time, explorers had none of the technological sophistication and tools available today. A comparison of modern-day exploration with the late 19-century journey of the HMS Challenger<span>illustrates the progress that science has made in ocean exploration.</span>
