| Kerogen
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| Solid, insoluble organic material found in oil shale.
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| Keystone species
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| Critical species in an ecosystem whose loss profoundly affects several or many others.
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| Kilowatt
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| One thousand watts. See watt.
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| Kinetic energy
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| Energy contained in moving objects such as a rock rolling down a hill, the wind blowing through the trees, or water flowing over a dam.
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| Known resources
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| Those that have been located but are not completely mapped but, nevertheless, are likely to become economical in the forseeable future.
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| Kwashiorkor
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| Dietary deficiency caused by insufficient protein intake; common in children one to three years of age in less developed countries. Characterized by growth retardation, wasting of muscles in limbs, and accumulation of fluids in the body, especially in feet, legs, hands, and face.
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| Kwashiorkor
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| A widespread human protein deficiency disease resulting from a starchy diet tow in protein and essential amino acids.
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| Kyoto Protocol
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| An international agreement among the developed nations to agree to curb greenhouse gas emissions, forged in December 1997.
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