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CSCC Geology 101
Terms for Geology 101 at Columbus State Community College
13
Geology
Undergraduate 1
02/03/2009

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Term
Solstice
Definition
December 21/22, June 21/22
Term
Equinox
Definition
March 21/22, September 21/22
Term
Eccentricity
Definition
Shape of the earth's orbit.
Elliptical at the present.
Term
Obiquity
Definition
Tilt of the earth on its axis.
23.5 degrees at the present.
Term
Precession
Definition
The wobble of the earth on its axis.
Term
Size and age of the earth
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
Term
Latitude
Definition
Run east and west, but measure north and south.
Columbus- 40 degrees N Latitude
Term
Longitude
Definition
Run north and south, but measure east and west.
Columbus is at 83 degrees W Longitude
Term
Crust
Definition
12-70 km thick
Continental is less dense than oceanic
Term
Mantle
Definition
70-2890 km thick
Asthenosphere- about 100 km deep, where rocks start to turn plastic
Term
Outer core
Definition
2890-5150 km deep
Liquid iron and nickel
Term
Inner Core
Definition
5150-6370 km deep
Solid iron and nickel
Responsible for earth's magnetic field
Term
Asthenosphere
Definition
100 km deep
Where rocks start to turn plastic
Magma is produced here
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