<a href="https://cdn.zmescience.com/wp-content/uploads/2011/05/tectonic-plate.jpg"><img class="aligncenter size-full wp-image-7065" title="tectonic plate" src="https://cdn.zmescience.com/wp-content/uploads/2011/05/tectonic-plate.jpg" alt="" width="500" height="607" /></a> This week's picture shows the Eurasian and the American tectonic plates, as seen from underwater. In a way, you could say this is the edge of the Earth