Answer:
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The distribution of earthquakes outlines the boundaries of the earth's tectonic plates. The crust is broken up into slabs of rock called tectonic plates. There are seven major plates and many smaller ones. The boundaries of these plates, where they interact with each other is marked by earthquake activity. The plates diverge, converge or slide past each other at slow rates. The movement of the plates generates earthquakes.
This process is known as thermohaline circulation. In the Earth's polar regions ocean water gets very cold, forming sea ice. As a consequence the surrounding seawater gets saltier, because when sea ice forms, the salt is left behind. As the seawater gets saltier, its density increases, and it starts to sink.
