How are new seas formed?

Seas arise at places where the Earth's crust cracks open due to expansion. Around 200 million years ago the Atlantic was formed in this way. Today in East Africa, a crack from Malawi to Ethiopia has formed as...

How were mountains formed?

Mountains are formed in two ways. When the tectonic plates move, they collide against each other. When the heavy oceanic part of the plate collides with the continental part, it submerges below it. The Andes, for instance, were...

Who discovered the continental drift?

This discovery is credited to the German geologist Alfred Wegener. He not only discovered that the coastline of South America fits very well against that of Africa but also showed that the fossils in both the coastal regions...

How many plates does the Earth’s crust have?

The relatively solid Earth's crust-and a part of the layer that lies below it-is divided into seven large and more than ten smaller plates. These plates float over the hot, viscous layer, which is constantly in motion-likeboiling soup....

Did the Earth always look as it does today?

No, since its origin about 4.8 billion years ago, our planet has undergone a lot of changes. The initial ball of fire cooled down and the surface slowly turned solid. Today, we know that the Earth's crust is...