Term
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Definition
| December 21/22, June 21/22 |
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Term
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Definition
| March 21/22, September 21/22 |
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Term
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Definition
Shape of the earth's orbit.
Elliptical at the present. |
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Term
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Definition
Tilt of the earth on its axis.
23.5 degrees at the present. |
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Term
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Definition
| The wobble of the earth on its axis. |
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Term
| Size and age of the earth |
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Definition
4.56 billion years
25,000 miles in circumference
Rotates on its axis at about 1000 mph
Revolves around sun at 67,000 mph |
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Term
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Definition
Run east and west, but measure north and south.
Columbus- 40 degrees N Latitude |
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Term
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Definition
Run north and south, but measure east and west.
Columbus is at 83 degrees W Longitude |
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Term
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Definition
12-70 km thick
Continental is less dense than oceanic |
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Term
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Definition
70-2890 km thick
Asthenosphere- about 100 km deep, where rocks start to turn plastic |
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Term
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Definition
2890-5150 km deep
Liquid iron and nickel |
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Term
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Definition
5150-6370 km deep
Solid iron and nickel
Responsible for earth's magnetic field |
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Term
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Definition
100 km deep
Where rocks start to turn plastic
Magma is produced here |
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