Tides
What makes the tide go in and out?
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  Facts
  • The gravity of the moon is the main influence on the tides.
  • The moon’s gravitational attraction creates tidal bulges in the Earth’s oceans.
  • When the Earth moves into a bulge the water levels rise – high tide, and when it moves out the water level drops – low tide.
  • The pattern changes to make this occur nearly an hour later each day.
 
  Did You Know?
  • High tide happens every twelve hours.
  • Low tides happen between each high tide.
  • Scientists believe Earth spins because a meteorite about the size of Mars hit it over 4500 million years ago.
  • Most beaches have a high tide mark and a low tide mark and the tide seldom goes higher or lower than these marks.
  • You’ll find different types of sea creatures at the two tidemarks.
  • Creatures at the high tide mark have to be pretty tough because they have to go without water for up to 12 hours.
 
  Experiments
Find out how to make your own Tide Simulator by sending a self-addressed, stamped envelope to:
Tides
Auckland Observatory
PO Box 24,180
Royal Oak
AUCKLAND
 
  Investigation
Time the tide. Next time you make a day trip to the beach take a note of what stage the tide is at. Is it high or low tide; is the tide coming in or going out? Does it change while you’re at the beach? What happens?
 
  Jokes
What can’t get any wetter no matter how much it rains?
The ocean.
 


 
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