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15 Cards in this Set
- Front
- Back
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orbit
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the path taken by one body circling around another body
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collide
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to come together with solid impact
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depressed
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low in spirits; sad
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disposable
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made to be thrown away after use
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hemisphere
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one half of the earth (divided by the equator or a meridian)
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endangered
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threatened with extinction
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species
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a category of living things
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extinct
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no longer existing
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ozone layer
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a layer of the earth's atmosphere
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environment
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the circumstances, conditions, or objects by which one is surrounded
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encouraged
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(1) to feel courage or hope (2) to try to persuade
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recycle
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to use again
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solar system
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a star with the group of heavenly bodies that revolve around it
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earthlings
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one who lives on the planet earth
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pantomime
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a silent performance in which a story is told by movements of the body or face
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