Expressions (A–Z)
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C
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Celestial Body
A mass of matter in space.
129 views
L
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Law of Conservation of Matter
A physical principle according to which matter is not lost in a chemical or mech...
53 views -
Law of Universal Gravitation
A physical law that defines the force of attraction between objects with mass.
51 views
M
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means of communication
Mass communication channels such as radio, television, and the press.
159 views