Core of the earth is the

(A) innermost layer
(B) outer layer
(C) atmosphere over the layers
(D) middle zone

The answer is: (A) innermost layer
Core of the earth is the innermost layer of the planet Earth.

The most abundant element of Earth’s Crust is

(A) Oxygen
(B) Nitrogen
(C) Aluminium
(D) Silicon

The answer is: (A) Oxygen
The most abundant element of Earth’s Crust is Oxygen (O), about 46.6%, including Oxygen in the waters on the Earth and atmosphere.

Which of the following is the shallowest sea in the world?

(A) The Weddell Sea
(B) The Sea of Azov
(C) The Black Sea
(D) None of these

The answer is: (B) The Sea of Azov
The Sea of Azov is rich in marine life because it is the shallowest sea in the world, with the depth varying between 0.9 and 14 metres.

The term “hydrosphere” refers to

(A) Zone of water
(B) Zone of Air
(C) Zone of Atmosphere
(D) Zone of earth crust

The answer is: (A) Zone of water
The watery part present on our planet is called hydrosphere.