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| what controls the color of the sun? |
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| What are the basic motions of the earth? |
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Definition
Revolution- 365 days
Rotation- 24 hours
Precession- 26000 years |
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| what is earths obliquity tilt? |
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Definition
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| What effects does the obliquity tilt have? |
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Definition
| it causes seasons which are also affected by the moon and sun. |
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Term
| layers of increasing density are? |
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Definition
this crust= 2.5-3.0
rocky mantle= 3.2-5.0
mantle core= >10 (alost has the most mass and the densest) |
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| what is the planetary radius? |
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Definition
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| 3480km- (1/8th of earth's volume) |
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| what are the physical properties of earth? |
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Definition
| lithosphere, asthenosphere, mesosphere, outter core and inncer core |
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Definition
| upper most 100km, cold and strong, crust upper mantle |
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Definition
| lower part of manlte, hot and plastic, solid and liquid |
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| chemical properties of the crust |
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Definition
oceanic-
depth of 5km
density of 3.0
made of basart-dark, heavy
coninental-
granite
30-40km
2.8 gm/cm3 |
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Term
| chemical properties of the mantle |
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Definition
silicate rock
3000 km thick |
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Term
| chemical properties of the core |
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Definition
outer-
liquid iron alloy
2000 km thick
inner-
solid iron ball
1200 km thick |
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| what does the mantle convection do? |
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Definition
-it removes heat from the earth's interior, circulating the heat
-occurs of a 100 million year timscale
-we know this through seismic tomography |
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Definition
-composed of basartic rock
-density of 2.8-3.0 g/cm3
-5-10km thick (thinner than continental) |
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Term
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Definition
-composed of granite rock
-density= 2.7-2.8g/cm3 |
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| lithospheric block composed of... |
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Definition
| crust, rigid uppermost mantle |
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Term
| lithospheric block is how thick? |
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Definition
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Term
| how much sediment do ridge crests have? |
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Definition
| little sediment because they are so young. |
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Term
| calcareous oozes on ridge flanks... |
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Definition
| increase in thickness with age of crust |
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