Our Atmosphere And Its Pollutants

GenX-Education

Watch Our Atmosphere And Its Pollutants - GenX-Education on Dailymotion

Transcript

00:00Hi kids! Today we will learn how important is our atmosphere and what's

00:09polluting it. So let's start! Our earth is surrounded by a blanket of air called

00:18atmosphere. It is composed of a mixture of gases, dust particles, and water vapors.

00:30The atmosphere protects the earth and allows life on earth. The atmosphere

00:37contains 21% of oxygen that living things need for respiration.

00:46The atmosphere contains 0.03% carbon dioxide which all plants need for

00:54respiration. The solar radiations or solar energy passes through atmosphere

01:02before reaching the earth's surface. The solar radiations also contain harmful

01:10ultraviolet rays and these harmful ultraviolet rays are filtered out by the

01:17ozone layer which is a part of the atmosphere. And life on earth gets only

01:24the good part of the solar radiations. When the earth gets heated upon, getting

01:30the solar radiation, the earth's surface reflects off this energy into the space

01:36at nighttime. But gases like carbon dioxide absorbs these reflected

01:42radiations and prevents earth from becoming freezing cold by reflecting off

01:48all the solar radiations. And this is known as greenhouse effect. As if all the

01:57heat reflected back by the earth's surface is allowed to escape into the

02:02space, our earth will become too cold at night that life cannot survive. It is the

02:10atmosphere because of which optimum temperatures is maintained on earth for

02:16the life to exist on earth.

02:20So without atmosphere we would be burned by the intense heat of the Sun during

02:27the day or frozen by the very low temperatures at night.

02:34The atmosphere also shields the earth from collisions with meteors and other

02:41small heavenly bodies. As these small heavenly bodies burn in the sky before

02:48hitting the earth's surface, so atmosphere acts as our shield. Oxygen

02:57levels of 21% is maintained by the atmosphere which is just apt for the

03:04life to survive. The atmosphere plays an important role in water cycle too. Water,

03:12one of the most essential elements for living things, is present in the air.

03:18Water bodies underground and even on hilltops.

03:25And this water is in a mode of continuous movement on, above, or below

03:33the surface of the earth. And this movement of water is called water cycle.

03:39And this water cycle too is regulated with the help of our atmosphere. So kids,

03:47it's the atmosphere that provides necessary gases for living things to

03:52survive. And it's the atmosphere that regulates the heat from the Sun to just

03:58the right temperature on earth. And it's the atmosphere that plays a very

04:04important role in water cycle too. And it's the ozone layer of atmosphere that

04:11protects the living things from the harmful UV rays. Our atmosphere also

04:17protects us from heavenly bodies like meteors. In our solar system, only two

04:26planets other than Earth have atmospheres, and they are Venus and Mars.

04:34Kids, we learned how important our atmosphere is, but unfortunately we are

04:42polluting our atmosphere. Let's see what is air pollution. The

04:49wanted and harmful substances in the air is termed as air pollution.

04:57Any additional gases, particles, or odors that are introduced into the air can

05:04cause harm to the living things and can be termed as pollution. Pollutants. Things

05:14that pollute the air are called pollutants. Common examples of pollutants

05:20include nitrogen oxides, carbon monoxides, hydrocarbons, sulfur oxides, sand, dust

05:30particles, and organic compounds.

05:35Pollutants can be classified into two types. Primary pollutants, secondary

05:43pollutants. Primary pollutants are those gases or particles that are introduced

05:50into the air through activities like volcanoes, dust storms, smoke from forest

05:58fires, vehicles, thermal power plants. There are all gases like carbon monoxide,

06:08sulfur dioxide, and dust particles.

06:14Now let's see what are secondary pollutants. When primary pollutants in

06:19the air mix up, they form even more harmful substances in the air, which are

06:26called secondary pollutants. Smog is an example of secondary pollutants. Smog is

06:35a form when fog is mixed with smoke and a poisonous form of fog is formed which

06:42we call as smog. So kids, that's all for today. Today we learned what is atmosphere,

06:52what is the role of atmosphere, what is pollution, and various types of pollutants.

06:59Now you may go ahead and take a quiz to learn more. Bye-bye!

Category

Transcript

Recommended