The lithosphere is the outermost covering of the Earth.

An excerpt from the article 25 facts about Earth

It is made of tectonic plates that are constantly moving. Earthquakes may occur in zones where these plates collide and rub against one another. In such areas, mountains also rise or create faults (e.g. the Mariana Trench). The largest tectonic plates on Earth are Pacific, African, North American, Eurasian, Antarctic, Indo-Australian, and South American.