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Give the names of two energy sources that are exhaustible. Give reasons for your choice.

Coal and petroleum are exhaustible sources of energy. These are fossil fuels.
The estimated reserves of these fuels are said to last us for about another 200 years while it takes millions of years for these to be produced.

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Can any source of energy be pollution-free? Why or why not?

A solar water heater cannot be used to get hot water on

a sunny day
a cloudy day
a hot day
a windy day

Name two energy sources that you would consider to be renewable. Give reasons for your choices.

Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG? Why or why not?

Sources of Energy

Give the names of two energy sources that are exhaustible. Give reasons for your choice.