Page 113 - ICSE Chemistry 6

• Non-conven onal energy sources like water, wind, sun, etc., should be used in place of conven onal
fossil fuels like coal, petrol, etc.
• Organic farming should be prac sed to reduce air pollu on. Fer lisers can be replaced with organic
manures.
• The concept of reduce, reuse and recycle should be prac sed. Reduce waste whenever possible,
reuse the old stuff , for example, old jars can be used for storage purposes and always opt for
recycled products.

Nature Care
As we have studied that plants reduce the eff ects of pollu on. They maintain the balance between oxygen
and carbon dioxide. So go to the nearby park and plant fi ve trees of diff erent varie es. Also, take care of these
trees.

ATMOSPHERE

The blanket of air that surrounds the earth is called atmosphere. The atmosphere extends up to a height
of 1500 km above the earth, however, it hardly exists above 480 km. About 90 per cent of it lies within the
height of 16 km from the earth’s surface.

The atmosphere is thicker near the earth’s surface as it is held in place by the earth’s gravity.
The atmosphere plays an important role in determining weather condi ons such as winds and storms. It
acts as a screen and blocks out the harmful ultraviolet radia on from the sun.

The atmosphere also protects the earth against meteors. Most of the meteors burn up in the atmosphere
even before they can hit.

Take a Break!

Write/Choose the correct answer.

1. Burning of fossil fuels helps in reducing air pollu on. (True/False)
2. __________ is an example of natural pollu on source.
3. Air pollu on causes respiratory infec ons. (True/False)

4. __________ results in reduced fer lity of soil.
5. Plan ng trees is the best solu on to air pollu on. (True/False)

Terms to Know

Atmosphere: The layer of air that surrounds the earth

Respira on: The process in which oxygen is used to break down food and release carbon dioxide,
water and energy
Photosynthesis: The process by which plants make their own food using carbon dioxide, water and
sunlight in the presence of chlorophyll

99