The diameter measured from pole to pole of the Earth is known as the polar diameter.
The Earth is the third planet from the sun.
The Earth's diameter is only 12,742 km.
It is the fifth-largest planet in terms of size. The poles are slightly flattened.
The Earth's shape is known as a Geoid.
Life-supporting conditions are most likely found only on Earth.
It has water and air, both of which are critical for survival.
The air contains life-sustaining gases such as oxygen. The earth appears blue from space because water covers two-thirds of its surface. It is also known as a blue planet.