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The total quantity or weight of organisms in a given area or volume


unit of heat defined as the quantity of heat required to raise the temperature of 1 gram of water by 1 degree centigrade at atmospheric pressure


The using up of a resource


The strength and vitality required for sustained physical or mental activity

Fossil Fuels

fuel consisting of the remains of organisms preserved in rocks in the earth's crust with high carbon and hydrogen content

Fuel Cell

The strength and vitality required for sustained physical or mental activity


engine that converts mechanical energy into electrical energy by electromagnetic induction


Of, relating to, or produced by the internal heat of the earth


electricity produced by water


supplying motive force

Law of conservation

matter cannot be created or destroyed


Of or relating to the nucleus of an atom


The presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects


The ability to do something or act in a particular way, esp. as a faculty or quality


Of, relating to, or determined by the sun


the difference in electrical charge between two points in a circuit expressed in volts

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