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I Wonder Why – Why The Tide Comes In And Goes Out Again?

swish swash.

Why does the tide come in and go out again?

● The two primary agents when it comes to the motion of the ocean are the Sun 

and the Moon. 

● Gravity also has a more directly observable influence on our planet. Specifically, 

gravitational  forces  are responsible  for  the rise  and  fall  of  the  ocean’s  tides  all 

over the world. 

● Both the Moon and the Earth are constantly moving through space. Since the 

Earth  spins  on  its axis,  water  is  kept  balanced  on  all  sides  of  the  planet 

through centrifugal force. 

● The  Moon’s  gravitational  forces  are  strong  enough  to  disrupt  this  balance  by 


accelerating the water towards the Moon. This causes the water to ‘bulge.’

● The  Earth’s  rotation  causes  a  sympathetic  bulge  on  the  opposite  side  of  the 

The planet as well. The areas of the Earth where the bulging occurs experience high 

tide and the others are subject to a low tide. 

● The height of the tides can vary during a month, because 

the Moon is not always the same distance from the Earth. 

● When the Sun and Moon are aligned on the same side as the Earth, the tides 

they cause ­ which are stronger than usual since they are pulling together ­are 

called Spring tides.

● Conversely, when the Sun and the Moon are at right angles to each other and 


are pulling in opposite directions, tides are weaker and are called neap tides.