the force of attraction by which terrestrial bodies tend to fall toward the center of the earth.

National Aeronautics and Space Administration.

between or among nations; involving two or more nations: international trade.

to draw back, as in retreat or avoidance: to shrink from danger; to shrink from contact.

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Question	Answer
gravity	the force of attraction by which terrestrial bodies tend to fall toward the center of the earth.
spine	ridge, as of ground or rock.
NASA	National Aeronautics and Space Administration.
international	between or among nations; involving two or more nations: international trade.
shrink	to draw back, as in retreat or avoidance: to shrink from danger; to shrink from contact.