Milankovitch Cycles Organizer

Define the following terms and answer the related questions.

I.  PRECESSION: 

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	1.  How frequently does the Earth complete a cycle of precession?
	
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	2.  Where is the Earth now in the cycle?

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II. ORBITAL ELLIPITICITY: 

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	1.  What happens when the Earth’s orbit is most elliptical?

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	2.  How long does it take to complete an elliptical cycle?

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III. NUTATION: 

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	1.  What causes the Earth’s seasons?

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	2. How do the seasons vary with nutation?

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	3.  How long is a cycle of nutation?
	
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IV. CLIMATE VARIATION: 

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1.  What happens when all three cycles unite to produce cooler summers?

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2.  What happens when all three cycles unite to produce warmer summers?

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Why doesn’t the climate in the Southern Hemisphere affect the cycle of Ice Ages?  ____________________________________________________________

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Where are we now in the cycle?  ____________________________________________________________

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