The crust is the thinnest layer of the Earth. It has an average thickness of about 18 miles (30km) below land, and around 6 miles (10km) below the oceans. The crust is the layer that makes up the Earth's surface
The mantle is the largest layer of Earth's interior, making up approximately 84% of Earth's volume. The mantle is mostly solid rock, but behaves like a viscous fluid over long periods of time, and forms convection currents due to the heat coming from the core. The mantle is mostly ultramafic rock.
The core is believed to be composed of an iron–nickel alloy with some other elements. The temperature at the inner core's surface is estimated to be approximately 5,700 K (5,430 °C; 9,800 °F), which is about the temperature at the surface of the Sun.
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1st Box: Crust
2nd Box: Mantle
3rd Box: Core
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