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Physical Geology Lecture 1
lecture 1
14
Geology
Undergraduate 2
09/19/2010

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Term
Physical Geology
Definition
the scientific study and processes and forces involved in the inorganic evolution of the earth
Term
radius of the earth
Definition
6370 km
Term
continental crust thickness
Definition
up to 40 km thick
Term
oceanic crust thickness
Definition
up to to 10 km thick
Term
core
Definition
spherical mass composed largely of metallic iron with some nickel, sulfur, silicon, and other elements
Term
mantle
Definition
thick shell of dense rocky material that surrounds the core
Term
crust
Definition
thin outer shell of rocky material that is less dense than the rocks of the mantle below
Term
Eratosthenes
Definition

first calculation of the radius of the Earth was carried out by this Greek Astronomer in 230 BC

6207 km

Term
6336 km
Definition
radius of earth calculates using 20th century technology
Term
expanding earth
Definition
tension on surface
Term
shrinking earth
Definition
compression on surface
Term
1%, 84%,15%
Definition
percentage volume of Earth by crust, mantle, and core
Term
Convection Currents
Definition
occurs because the density of a fluid is related to its temperature. Hot rocks lower in the mantle are less dense than their cooler counterparts above. The hot rock rises and the cooler rock sinks due to gravity
Term
the rock cycle
Definition
introduced by james in 1795
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