The atmosphere<span> also protects living things on </span>Earth<span> from the sun's harmful ultraviolet radiation. A thin layer of gas called ozone high up in the </span>atmosphere<span> filters out these dangerous rays. The </span>atmosphere<span> also helps to sustain life of </span>Earth<span>.</span>
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.
