"Traditionally we've been taught the Earth has four main layers: the crust, the mantle, the outer core and the inner core," ...

3. Explain that the Earth is made of three main layers: crust, mantle, and core. Draw them on the board using colored chalk. Explain that the core is divided into two layers: solid inner core and ...

Beyond the outer core lies the mantle, a 1,800-mile-thick layer of viscous molten rock ... about three miles thick—and denser. Planet Earth, explained Like Venus and Mars, Earth has mountains ...

The Earth formed over 4.6 billion years ago out of a mixture of dust and gas around the young sun. It grew larger thanks to countless collisions between dust particles, asteroids, and other growing ...