Earth is made up of several layers: the lithosphere, asthenosphere, lower mantle (also known as mesospheric mantle), outer core and inner core.

The solid layer of Earth’s mantle lies between the crust and the core and is about 2,900 kilometers (1,802 miles) thick, making up 84% of Earth's volume and 67% of its mass.

The junction between layers of atmosphere is usually not a discreet line, but rather a transition zone where one blends into another. The change may happen over miles.

According to NASA the upper layer of Earth's atmosphere — the exosphere — extends up to 6,200 miles (10,000 km), above which the atmosphere and space blend.

A discovery about Earth's core shows a "doughnut" shaped layer, in which earthquake waves travel slower than the rest of the core. A study published in Science Advances points to silicon and ...

Scientists have known about Earth’s ozone layer for over a century, but it wasn’t until the 1970s that they grew concerned about its integrity. Early in the decade, ...