Summary:
- 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.