CLASS -5|| SUBJECT - SST|| LESSON 12 || OUR ENVIRONMENT||

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LESSON 12

OUR ENVIRONMENT

1.     What does the term environment mean?

Environment refers to the natural world of air, water, and land etc. where human beings animals and plants live. It comprises the circumstances, objects or conditions by which one is surrounded. Environment includes both biotic and abiotic components.

 

2.     What do the Abiotic components include?

Abiotic components include non-living things like land, water and air. Land is the solid surface of the earth on which human beings, animals and plants live.

 

3.     Mention any two positive aspects of the interdependence between the different regions of the world.

People all over the world are interdependent and interconnected. Countries depend on each other which creates global interdependence. Some countries have a well-developed industrial sector but are not good at agriculture. On the contrary, some countries have a well-developed agricultural sector but are not good at manufacturing things. The countries which have a good industrial sector export industrial products and import agricultural products. On the other hand, countries good at agriculture, import industrial items and export agricultural products.

 

4.     Explain Global warming.

The steady rise in the Earth’s surface temperature as a consequence of increased greenhouse effect is called global warming. Due to global warming the ice on the earth is melting slowly. This is resulting in an increase in the mean sea level. Heat waves droughts blizzards, etc. are increasing. The habitat of plant and animal species is being largely disturbed.

 

5.     What is the ozone layer? Why is it depleting?

Ozone layer is a belt of ozone gas in the atmosphere which prevents us from the ultraviolet radiation of the sun.  Pollution is the main reason of the ozone depletion. Pollutants like chlorine, smog, bromine and other gases are depleting the ozone layer. Harmful smoke are weakening the protective ozone layer.

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