tides, the daily rising and falling levels of the oceans and other large bodies of water, what causes tides, the gravitational pull of the moon and sun, Spring Tides, large tides that occur when the pull of the moon's gravity and the pull of the sun's gravity reinforce each other., Neap Tides, small tides that occur when the pull of the sun works in opposition to the pull of the moon, When does a Spring Tide occur?, during a full moon and a new moon, When does a Neap Tide occur?, during a first quarter and a third-quarter moon

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