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Axis

 

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      an imaginary straight line around which an object spins

 


Sentences:
Earth spins on its axis once every 24 hours.

Earth’s axis goes from the North Pole through Earth’s center to the South Pole and is tilted.
 


Related Links:
What's a Solstice?
What Causes the Seasons?

 

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Earth during the winter solstice
Seasons are caused by the tilt of Earth’s axis.
Image Credit: 
NASA
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Page Last Updated: July 14th, 2014
Page Editor: NASA Education