Earth's

One third of the earth's surface is desert.

The sea covers nearly three-fourths of the earth's surface.

Although rainforests make up only two percent of the earth's surface, over half the world's wild plant, animal and insect species live there.

But the earth's magnetic field is very weak.

Pigeons can find their way home with the help of the Earth's magnetic field.

So the pigeon can feel the magnetic field on its head, but it can't feel the Earth's magnetic field.

This may be because they could not use the earth's magnetic field.

The magnetite is attracted to the earth's magnetic field.

The moon is the earth's only satellite.

The moon is the Earth's satellite.