List of Words for Letter ‘N’
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natural gas
a mixture of gaseous hydrocarbons formed from marine organisms
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natural resource
a material people take from Earth
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nekton
animals such as flounder, tuna, and squid that swim through the water; can be found in any ocean zone
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neritic zone
the ocean zone from the low-tide line to the point where the ocean floor drops off
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niche
the role of an organism in an ecosystem
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nitrate
one usable form of nitrogen absorbed by plants and used to make proteins
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nitrite
another usable form of nitrogen absorbed by plants and used to make proteins
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nitrogen cycle
the continuous trapping of nitrogen gas in compounds in the soil and the returning of nitrogen gas to the air
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nitrogen-fixing bacteria
certain bacteria that live in the roots of beans, peas, and peanuts and can extract nitrogen from the air
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nonmonetary cost
the environmental consequences of energy use; examples include the generation of pollution and long-term health problems caused for people
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nonrenewable resource
a material that people take from Earth and that cannot be replaced within a short period of time or at all like coal, oil, and natural gas.
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North American Plate
lithospheric plate that includes almost all of North America and part of the Atlantic Ocean
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nuclear fuel
a material, such as uranium, that can be used in nuclear reactors as a source of energy
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nuclear power plant
a facility that generates electricity through nuclear reactions