The
earth is (after Mercury and Venus) the third-closest planet of the solar
system from the sun. It is classified as a (terrestrial) planet. The earth
moves, like all planets, in an elliptical orbit, in which the sun is the
central point. Our home planet consists of approximately 2/3 water and 1/3 continental mainland. Beside the water, which is
essential for our surviving, the earth also contains numerous treasures -
valuable minerals and noble metals.
Mankind has used these raw materials for thousands of years, in particular also for constructions.
