OCEANS ALIVE
The Ocean in Motion - Tides
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Did you know that tides are caused by the moon? Just like earth, the moon has a force of gravity gravity. When the moon is directly over the ocean, its gravity pulls the water higher ©theRshore. eadyEdPubl i cat i ons up on to
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High Tide (a)
Low Tide (b)
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Image courtesy Microsoft Design Gallery
Teac he r
If you visit a beach at different times during the day, there will be some times where the water will be further up the beach. This is caused by changes in the tide tide.
o c . che e r Amazing o t r s supe r Fact: Moon
There are two high tides and two low tides every 24 hours.
Earth
Low Tide (b)
High Tide (a)
The Bay of Fundy, off Nova Scotia in Canada, has a tide rise and fall of 16 metres – about as tall as a threestorey building! 19