(a) How do we classify fuels? Pg.96
(b) How does the amount of carbon dioxide affect our environment? P9.98
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(a)The fuel can be classified into three type's mainly liquid, solid, and gaseous on the bases of their physical state
(b)Carbon dioxide controls the amount of water vapor in the atmosphere and thus the size of the greenhouse effect. Rising carbon dioxide concentrations are already causing the planet to heat
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