(1) What do you mean by biosphere?

(2) Name the highest and the deepest places of the Earth.

(3) Write down an important feature of troposphere.

(4) Why is the Earth called the 'blue planet'?

(5) Name the two continents that lie entirely in the southern hemisphere.

(6) Name two important gases of atmosphere.

(7) Give any two methods of protecting environment.

(8) What do you mean by 'Hydrosphere'?

(2) Name the oceans found over the Earth's surface. Also give important features of the Pacific Ocean.

(1) Differentiate between atmosphere and lithosphere.

(3) How are the human activities responsible for creating imbalance in environment?

(4) Give a brief description of the layers of atmosphere with a diagram.

(5) State the importance of biosphere.

(a) Mt. Aconcagua is the highest peak in ___________.

(1) ____ and ____ are the research stations of India in Antarctica.

(2) Atmosphere consists _____ per cent of nitrogen.

(3) ____ is a unique feature found along the north-eastern coast of Australia.

(4) The watery part of the Earth is known as _______

(5) The parts of the Indian ocean, the Atlantic ocean and the Pacific ocean which surrounds Antarctica are called ______. 

(e) The stratosphere is the uppermost layer of atmosphere.

(f) The Pacific ocean is the largest ocean in the world.