The first attempt of estimating the size of the earth was made by whom?

Which is the only natural satellite of earth?

One stadia is equal to -------- metres.

What is the average distance between earth and moon.

From the following which is the optimum distance between sun and earth.

Which position does the Earth stands in terms of size in our solar system?

The layer of water on the surface of Earth is called --------

From the following which indicates the percentage of water present on earth surface?

Which is the hottest planet in the solar system?

Polestar appears vertically overhead at the ----------- .