Answer:

High and low tides are caused by the Moon. The Moon's gravitational pull generates something called the tidal force. The tidal force causes Earth—and its water—to bulge out on the side closest to the Moon and the side farthest from the Moon. These bulges of water are high tides.

•When the Sun and Moon are in line with the Earth (when a full moon or new moon occur), their combined gravity cause very high tides (and very low tides), known as “spring tides.”So the Moon affects the tides because of gravity, but gravity from the Sun and the spinning of the Earth also change how the tides behave.

•Tidal forces on the side of Earth closest to the Moon pull material (mostly water) toward the Moon. Tidal forces on the other side of Earth actually pull material away from the Moon.That's why tides around the equator are higher during both a new moon and a full moon (spring tide).