Earth

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Atmosphere

Exosphere

400 km - ~10,000 km (249 mi - ~6213 mi)

Thermosphere

50 km - 400 km (31 mi - 249 mi)

Mesosphere

30 km - 50 km (18 mi - 31 mi)

Stratosphere

10 km - 30 km (6 mi - 18 mi)

Troposphere

0 km - 10 km (0 mi - 6 mi)

Crust

Earth's crust is its thick outer shell of rock, referring to less than 1% of the planet's radius and volume.

The temperature of the crust increases with depth, reaching values typically in the range from about 100 °C (212 °F) to 600 °C (1,112 °F) at the boundary with the underlying mantle. The temperature increases by as much as 30 °C (54 °F) for every kilometer locally in the upper part of the crust.

Mantle

Upper Mantle

0 km - 410 km (0 mi - 255 mi)

The upper mantle is mostly solid, but its more malleable regions contribute to tectonic activity.

The Transition Zone

410 km - 660 km (255 mi - 410 mi)

Rocks undergo radical transformations. This is the mantle's transition zone.

The Lower Mantle

660 km - 2891 km (410 mi - 1,796 mi)

Outer Core

Earth's outer core is a fluid layer about 2,260 km (1,400 mi) thick, composed of mostly iron and nickel.

Inner Core

Earth's inner core is the innermost geologic layer of the planet Earth. It is primarily a solid ball with a radius of about 1,220 km (760 mi), which is about 20% of Earth's radius or 70% of the Moon's radius.

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