Earth – blue green colorful planet

Blue, green, Colorful Planet. They define the Earth in one way or another, the only one really known to us among the planets, authors of almost all science fiction novels. Blue, because that is the color of the sky as seen from the surface of the Earth and such …

The chemical composition of the earth's crust

The chemical composition of the earth's crust.

Rocks that make up the earth's crust formed as a result of long-term, rock-forming processes that take place sometimes for millions of years. During their history, they have undergone various displacements, so, that some formed deep in the earth's crust are now on the surface of the earth and …