It creates the Earth's magnetic field and is about 1,400 miles (2,300 kilometers) thick. The next layer is the mantle. Many people think of this as lava, but it's actually rock. The rock is so hot ...

Earth is divided into four layers: the inner core ... pushed upwards by the force of the plates' movement. Tall, steep volcanoes can also form as a result of the denser rock melting and the ...

Volcanoes inspire awe with spectacular eruptions and incandescent rivers of lava, but often their deadliest hazard is what ...

A giant patch of black, fossilized lava that was spewed across the Sahara desert over millions of years looks like an eerie, ...