Page 99 - Active Science 5 Ebook and Activity

it dirty. These dust particles enter our nose
and eyes that cause irritation. They can

also be the carrier of germs. Air pollution
causes many respiratory diseases like
cough, asthma, lung cancer and many
other breathing problems.

Let’s Recapitulate

Fill in the blanks.
1. All the things that surround us make our ________________.
2. Pollution causes harmful effects on ________________.

3. The presence of ____________, _____________ and ___________ causes air pollution.
4. In rural areas, people use ____________ and _____________ for cooking.

5. Dust particles in the environment enter our _________ and _________ that cause irritation.

Greenhouse Effect: When harmful gases like carbon dioxide, chlorofluorocarbons and
methane trap solar energy and do not allow it to escape from the atmosphere, it causes
Greenhouse Effect.

Factual Study
The Greenhouse Effect Motor vehicles release

Some solar radiation is carbon monoxide in
reflected by the Earth and the
atmosphere. the air. When we
Some of the infrared radiation passes breathe this polluted
through the atmosphere. Some is absorbed
and re-emitted in all directions by air, carbon monoxide
greenhouse gas molecules. ·The effect of
this is to warm the Earth’s surface and the goes into the blood and
lower atmosphere.
Most radiation is Atmosphere reduces the capacity of
absorbed by the Infrared radiation blood to carry oxygen.
Earth’s surface and Earth’s surface is emitted by the
warms it. Earth’s surface. This makes the person
feel weak and easily
tired.

The addition of carbon dioxide in air

because of air pollution, has increased the
temperature of earth. This is called Global
Warming. Due to global warming, glaciers
have started melting. Therefore, it has

resulted in the rise of water level of oceans
which increases the chances of floods.

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Active Science-5