Q3 of 19 Page 142

Which is a non-renewable resource?

Those natural resources which cannot be replaced are called non-renewable resources because it takes a very long time for their formation (millions of years) while their consumption occurs very quickly. So once they are used up they are gone forever.

Coal, petroleum and natural gas all are fossil fuels. Fossil fuels were produced from the remains of ancient plants and animals and their formation took a very long time. So all of the above are non-renewable resources.

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1

An example of water-borne disease is _________.

 2

The sedimented and floating materials are removed by this treatment process.

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_________ is the chief component of natural gas.

 1

The bar-graph indicates the prevalence / widespread attack of infectious diseases in two cities A and B. Observe it and answer the questions given below:

1. Dengue fever 2. Rat fever


3. Cholera 4. Chikungunya


a. What may be the reason for the disease in city A?


b. Which city needs a more effective system of waste-disposal and cleaning?


c. How can the disease be controlled in city A?