অনার্স অ্যাসাইনমেন্ট প্রশ্ন – Honors Assignment Questions

অনার্স অ্যাসাইনমেন্ট প্রশ্ন

Honors Assignment It is a general belief that dust is very harmful to us. But this is only

one side of the picture. Dust is also very useful to us. But what is

dust? How is it formed? Every solid substance is composed of

অনার্স এসাইনমেন্ট প্রশ্ন

very small particles. When these small particles of matter are

scattered, they become dust particles. For example, if we break a

brick or a stone into small pieces, it will turn into small particles

of dust. There are different ways by which dust is formed. When

অনার্স এসাইনমেন্ট

solid things break, dust is formed. Smoke which is generated by

the burning of coal, wood, petrol ete also produces dust. Dust

particles also come from plants, animal matter, sea salt, desert and

ash from volcanoes. These particles that get mixed with air are

called dust. Air carries dust particles from one place to another.

The particles of the earth’s surface also fly in the air in the form of

dust. Jhe biggest utility of dust particles is that they help in the

formation of rain. The water vapours in the clouds condense on

dust particles in the form of water drops. These drops fall on the

carth as rain. So, if there is no dust particle, rain will come late.

Dust also helps to form mist, fog etc.

The dust particles which are present in the air, scatter sunrise in all

Honors Assignment

directions. Because of this, there is no complete darkness even

long after the sunset. We see red colour in the sky at sunrise and

sunset because of dust particles. In this way, we see that the dust

particles which are thought to be harmful are often very useful too.

Honors Assignment Questions

 

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