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GLOSSARY
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orbit
- the path of one heavenly body circling or revolving around
another: The earth orbits the sun.
organic - related to living
things; gotten from plants and animals
oxygen - a colorless, tasteless,
odorless gas that forms about one fifth of the air: Plants and
animals need oxygen to live.
oxygen cycle - the movement
of oxygen between the atmosphere and living things
ozone - a form of oxygen with a
strong odor that is produced by electricity
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