Q4 of 35 Page 131

List out the harmful effects of burning coal.

Harmful effects of burning coal are as given below:

(1) Burning coal releases carbon dioxide in air, which is a greenhouse gas and leads to global warming.


(2) Coal burning also releases oxides of sulphur in air, which contribute to the process of Acid rain.


(3) The smoke from burning coal leads to increased unwanted particulate matter in the environments leading to air pollution.


(4) Harmful metals such as mercury, lead and arsenic are also released into environment from burning of coal, which when inhaled can lead to serious health problems such as damage of nervous system, immune system and digestive system. It is a serious threat to the development of a child.


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12

i) Name the processes noted as No. 1 and 3.

ii) Define process 1.


 1

i) Classify the following substances – wood, paper, plastic and grass.

ii) Give a detailed account of your classification.

 2

In your locality people are affected due to water scarcity. What measures will you take to deal with the problem of water scarcity?

 3

We are surrounded by smoke. Is this situation good for our health? Give reason.