All the planets revolves around the ____________.

The earth is made up of both land and ___________.

__________ has both air and water which living being needs to live.

________ is the centre of the solar system.

The point where the land and sea meet is called

______________ is also called Akash Ganga.

One fourth of earth's surface is _________.

In early days,people thought that the shape of earth was ____________.

The word planet is derived from a _________ word.

From where did the voyage of Magellan start?