The Earth’s axis is slightly tilted. This tilt gives us our seasons. The four seasons are spring, summer, autumn and winter. Winter is when the northern hemisphere (where we live) is tilted away ...

Earth science concentrates on investigating ... and similarities between the Earth and other planets. "Where we live is this really thin layer on top of an immense planet that's mostly beneath ...

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, about ...