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GLOSSARY
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natural resources - supplied by nature and used by humans such as water, land, oil, wood, and coal:
Natural resources are very valuable and should be used with care.
naturalist - a person who studies
nature, natural objects and natural history
nitrogen - a colorless, tasteless, odorless gaseous element that makes up the largest part of the earth's
atmosphere
nitrogen oxides - produced by the burning of fuels; a primary source of pollution and acid rain
nocturnal - active or happening in the night
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