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 ...

IN this brilliant and stimulating book, Prof. Joly has conveniently brought together the results of many years' work and thought on the radioactivity of the rocks. Its central theme is an ...

The outer core is liquid iron and nickel and generates the Earth's magnetic field. And the inner core is made of solid iron and nickel. The surface of the earth is constantly changing. It's the ...

This ocean is believed to contain 2-3 times the volume of Earth’s oceans. Observations from the Galileo spacecraft revealed a smooth, cracked surface, indicating liquid water beneath.