The imaginary line joining the North pole and the South pole is called the _____ 

The movement of the Earth around its axis is called _____

Revolution of the earth causes ____ numbers of seasons.

_______ was the first to sail around the earth.

The green colour of the earth shows _____

The Earth has an ____ rich atmosphere.

Earth is at least ____ billion years old.

The axis of the earth is slightly _____

Three quarter's of the planet's surface is covered with _____

The only natural satellite of the Earth is _____