 EARTH SCIENCE
Earth Statistics The Earth can be described mathematically as a spherical object with the following parameters: Equatorial circumference: Volume: Mass: Average density: The Earth's interior is divided into three parts: the crust, the mantle, and the core. The Earth's crust is 6 km deep under the oceans but about 30 km deep under land. Its mantle extends from 30 km to 2900 km; and its core extends from 2900 km to 6378 km, which is the center of the Earth.
Maximum depth of crust: Maximum depth of mantle:  The interior temperature of the Earth rises steadily from the Earth's surface to its center. The temperature reaches 6000oC near the center of the Earth.
The Earth is not a perfect sphere; it is flattened out at its poles as a result of rotation. Hence, the radius of the Earth varies with position.   The Earth rotates around the Sun in an elliptical orbit.
Average Earth-Sun distance:  Average orbital speed:
Average centripetal acceleration: Rotational period:
in mean sidereal time: in mean solar time:  Rate of rotation:  