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amber a hard, yellow or brown material that is used to make jewelry. It is a fossil that comes from the resin of pine trees. [1/2 definitions]
fossil fuel any carbon-containing fuel formed from the remains of prehistoric plants and animals. Coal, petroleum, and natural gas are examples of fossil fuel.
greenhouse effect the warming of the earth's surface that takes place when heat from the sun is held in by the earth's atmosphere. The greenhouse effect can be caused by too much carbon dioxide being released into the air from the burning of fossil fuels.