The diameter of the moon is ______ km.
3,400 km
3,490 km
3,480 km
3,485 km
Who is the Greek philosopher: Who state that the earth was in spherical shape?
Euclid
Archemides
Pythagoras
Aryabhatta
The presence of which factor made life possible on earth?
Oxygen
Nitrogen
Hydrogen
Helium
The layer of water on the surface of Earth is called --------
Lithosphere
Atmosphere
Hydrosphere
Thermosphere
Which layer present in the atmosphere absorbs harmful ultra violet radiations?
Keratin layer
Ozone layer
Radiation layer
None of thes
Which is the richest gas present in Earth?
Which is the only natural satellite of earth?
Sun
Mars
Moon
Pluto
Polestar appears vertically overhead at the ----------- .
South Pole
North Pole
Equatorial region
None of this
The first attempt of estimating the size of the earth was made by whom?
Hyppocrates
Eratosthenes
None of these
Who was the first to circumnavigate earth?
Vasco de Gama
Christopher Columbus
Magellan
Alexander
