Page 170 - Science Class 06

burning. If nitrogen is not present in the saves us from sun-burn and sunstroke. In
atmosphere all the things would be on fire. the month of May and June, people become

Argon (Ar) the vic m of sunstroke beause the air is
very dry during these months. But in July
Argon is also present in air, but in very
and August, the amount of moisture
nominal amount. This is an inert gas. It does
increases in the air which saves us from sun-
not react with heat of other metals.
strokes.
Therefore, it is used in electric bulbs.
Dust and Smoke
Neon (Ne)
A small amount of fine dust par cles is also
Neon is also present in nominal amount.
present in the air. When it rains, dust
This is u lised in tubelights and glowsign.
par cles in the atmosphere se le down and
Water Vapour sky looks quite clear. Smoke is produced by

A nominal amount of water vapour is also burning of fossil fuels. Dust and smoke are
present in the atmosphere. It is also very not good for our health. They may cause

useful to us in many ways. Water vapour respiratory diseases.
helps in watercycle. Water vapour also

1. Write the composi on of air.

2. What happen during the process of respira on?
3. How do aqua c animals take in air for breathing?
4. Write any five important uses of air.

5. What is the role of nitrogen in the atmosphere?

Hydrosphere : All the water bodies including ground water collectively called
hydrosphere
Hydroelectricity : Electricity generated by converting flow of water into electric energy
Groundwater : Water found under the surface of the earth

Deforestation : Cutting down or clearing forests at a large scale
Starvation : Acute shortage of food
Air : Mixture of various gases

Respiration : The process in which energy is released from the food we eat
Breathing : The process of taking air inside and giving out of the body
Gills : Organs of some aquatic animals that help in respiration

170 Science-6