'Sun is the main source of energy.' Justify this statement.

As we know that the sun provides both heat and light energy for all living beings. It is the main source of energy as it supplies energy for all organisms directly or indirectly. It is the storehouse of energy. It also supports the existence of other sources of energy like fossils, solar energy, hydroelectricity, bio-fuel, and so on. So, we can say that all the energy sources are the outcome of solar energy. So, the sun is the main source of energy.

The use of hydropower should be increased rather than that of petroleum products to get energy.

The power generated by rotating turbines using water is called hydropower. It is the main source of energy which is a pollution-free and renewable source of energy. Energy trapped in the flowing river is used to generate power on large scale in power stations which a cheaper for the long term & widely cued in electric devices. But petroleum products are temporary. They are only for a short period of time. These products are formed from the dead...

What is a fossil fuel? Give two examples.

The fuel formed from the fossils of plants and animals buried under the earth's crust for a long time is called fossil fuel. Any two examples are:

1. Coal
2. Petroleum products

Write any three advantages of hydropower.

Any three advantages of hydropower are:

1. It is a renewable source of energy.
2. It is eco-friendly.
3. It is cheaper in the long-term.