From the following which indicates the percentage of water present on earth surface?
80%
99%
50%
71%
Which layer present in the atmosphere absorbs harmful ultra violet radiations?
Keratin layer
Ozone layer
Radiation layer
None of thes
Who was the first to circumnavigate earth?
Vasco de Gama
Christopher Columbus
Magellan
Alexander
Which is the richest gas present in Earth?
Oxygen
Nitrogen
Hydrogen
Helium
The diameter of the moon is ______ km.
3,400 km
3,490 km
3,480 km
3,485 km
One stadia is equal to -------- metres.
150
200
175
185
What is the average speed of the revolution of the Moon around Earth?
3,750 Km
3,600 Km
3,700 Km
3,650 Km
When lunar eclipse occurs the shadow of earth falls on -----------
Sun
Moon
Jupiter
Mars
Which is the hottest planet in the solar system?
Venus
Mercury
Earth
The presence of which factor made life possible on earth?