Q3 of 19 Page 144

Fossil fuels are formed by decomposition of biomass buried under the earth over millions of years ago.

i) Name any three fossil fuels.


ii) Which fuel is used in the production of fertilizers?


iii) What is natural gas made up of?

i) We can list three fossil fuels as follows:

● Coal


● Petroleum


● Natural gas


Since coal, petroleum and natural gas all were formed from the dead remains (fossils) of living organisms, they all are examples of fossil fuels.


ii) Natural gas is used in the production of fertilizers. Natural gas is used as the source of hydrogen to combine with nitrogen to make ammonia (NH3) which is the foundation of a nitrogen fertilizer.


iii) Natural gas is primarily composed of methane (greater than 90%). Natural gas may also contain a small percentage of ethane, propane and higher hydrocarbons.


More from this chapter

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1

Observe the picture given below and find out what type of energy is produced


i) Identify whether this energy is conventional or non-conventional.


ii) Draw the given diagram and label it with the parts given below:


(battery, battery charger controller, solar incidence, DC load, battery system)


iii) In the given picture, _______energy is transformed into ______energy.

 2

i) What type of energy is produced in this picture?


ii) What difficulties do we face in harnessing this energy? Explain.


iii) Why do we say that this energy is better than solar energy and atomic energy?

 4

Wind power is generated from uneven heating of the earth’s surface by the sun and the hot core.

i) Which country is called the country of winds?


ii) Which country leads the world in harnessing wind energy?


iii) In which district of Tamil nadu do we have wind energy farm?


iv) In which of the following land forms will you be able to harness maximum amount of wind energy?


(plains, canals, valleys)

 5

Match the following: