✅1Q W3 | Lesson #1.1: Earth Formation and Internal Structure

Question 1

The internal structure and composition of the Earth have been known since mid-20th century. The American geophysicist (_) described the composition based on a broad array of seismological, experimental, and geochemical observations.

Answer 1

Francis Birch

Question 2

But early in Earth’s history, scientists think that it was partly melted, or molten. Even now, it is believed that the inside of the Earth is molten. Within the partly melted Earth, (_) The results of this separation are the three different layers formed within the Earth.

Answer 2

molten heavy elements such as iron and nickel, sank towards its center and lighter elements such as silicon, rose to the surface.

Question 3

Therefore, the (_)

Answer 3

earth has layers because of the varying densities of layers due to their chemical and mechanical compositions.