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15 Cards in this Set

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