The Earth's interior is composed of four layers, three solid and one liquid—not magma but molten metal, nearly as hot as the surface of the sun. The deepest layer is a solid iron ball ...

Some of these questions are easy enough for kids to answer ... For example: What are the four main layers of the earth? They would be the inner core, the outer core, mantle and crust.

Earth Day is almost here. What is Earth Day? It’s an annual event celebrated on April 22nd when activities are held in t ...