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| is biological material derived from living, or recently living organisms |
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| the using up of a resource. |
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| is one of the most fundamental parts of our universe |
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| A fuel cell is an electrochemical device that combines hydrogen and oxygen to produce electricity, with water and heat as its by-product. |
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| produced by the internal heat of the earth. |
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| the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects |
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| the ability to do something or act in a particular way, especially as a faculty or quality. |
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| relating to or denoting energy derived from the sun's rays. |
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