Why are coal, petroleum and natural gas called fossil fuels?
Coal, petroleum and natural gas are formed by fossils, so they are called fossil fuels.
Tips: -
Why are air, water and soil called natural resources?
Air, water and soil are provided by nature, so they are called natural resources.
Write the name of two natural substances.
(i) Air
(ii) Water
Name the different varieties of coal found in nature.
Peat, Lignite, Bituminous coal and Anthracite are different coal found in nature.