Petrol is used in the extraction of metals.
Name two each of the exhaustible and inexhaustible natural resources.
Write the name of two natural substances.
Why are air, water and soil called natural resources?
Why are coal, petroleum and natural gas called fossil fuels?
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(i) Coke burns without producing smoke whereas coal produces a lot of smoke on burning
(ii) Coke has a higher calorific value than coal.
(iii) Coke burns more readily than coal.
(iv) Coke leaves much less ash in burning as compared to coal.