B. Fill in the blanks. 1. Air, water, plants and animals are resources. 2. Metals and coal are_resources. 3. Sunlight is a renewable resource that (can/cannot) be exhausted. 4. Coal is a non-renewable resource that (can/cannot) be recycled. 5. Coal, natural gas and petroleum are together known as fuels. 6. A_ is a substance that can be burned to obtain energy and are higher grades of coal than lignite. 8. The process of separating petroleum into its fractions is called 7. 9. Natural gas consists mainly of
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