• Tides are daily changes in the level of ocean water.
  • They occur all around the globe.
  • The main cause of tides is the pull of the Moon’s gravity on Earth.
  • The pull is greatest on whatever is closest to the Moon.
  • Although the gravity pulls the land, only the water can move.
  • Tides keep cycling from high to low and back again.
  • In most places the water level rises and falls twice a day.
  • So there are two high tides and two low tides approximately every 24 hours.
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