Why do we not fall off from the Earth?
Gravity is the force of the Earth that attracts every object towards itself. From our perspective this force always acts downwards. For a long time people did not believe that the Earth is round because then the people 'underneath' the sphere would have actually fallen down. In 1687, a physicist, Isaac Newton, proved that the force of gravity always acts towards the centre of the Earth. On the Earth, the force of gravitation always acts 'downwards' irrespective of Eskimos in the Arctic region, people in Europe or inhabitants of Australia.
What is the atmosphere made up of?
The word 'atmosphere' means a gaseous cover enveloping a planet. Without atmosphere life would not have been possible on the Earth: One-fifth of the atmosphere is oxygen and four-fifths is nitrogen. Like the Earth's interior, the atmosphere too is made up of several layers. All animals and plants live in the lowermost layer of the atmosphere called the 'troposphere'. All weather phenomena take place in the troposphere. Even aeroplanes fly in the outer edge of the troposphere. The stratosphere, the mesosphere, the ionosphere, and the exosphere lie above the troposphere.
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