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Unit 5 Vocabulary Quiz will be Thursday, Jan. 29. Axis Gravity Moon’s gravity Phases Revolve *an imaginary line that passes through Earth’s center at the north and south poles *the natural force of attraction between very large objects such as planets *influences the ocean’s tides *when the moon appears to have different shapes and repeats every 29 1/2 days *to travel around the Sun in a closed path Rotate *when the Earth spins on its axis Sun *major source of heat energy for the Earth
