The Earth’s inner core is 3,000 miles below the surface and was thought to be a solid sphere held by gravity in the molten ...

This image shows blue spheres representing relative amounts of Earth's water in comparison ... Oceans account for only a "thin film" of water on the surface. Some fast facts: About 3,100 mi ...

A sphere is a perfectly round solid figure. All points on the surface of the shape are the same distance away from the centre – we call this distance the radius. The formula for the volume and ...