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Geology test 1
chapters 1,2,6,18,19 from the Essentials of Geology book
29
Geology
Undergraduate 2
02/10/2011

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Term
Physical Geology
Definition
Materials composing Earth and seeks to understand the many processes that operate beneath and upon it's surface
Term
Historical Geology
Definition
Understand the origin of Earth and it's development through time.
Term
Catastrophism
Definition
The concept that the Earth was shaped by catastrophic events of a short-term nature.

Notes
-Past Processes
-no longer operate today
-big or fast
-ones that operated beyond law of physics and chemist
Term
Uniformitarianism
Definition
Physical, Chemical , and biological laws that operate today also perated in teh geologic past

-"the present is the key to the past"

Notes
-Usually gradual but can be big and fast
-Obvious explanation
Term
Relative Dating
Definition
Events are placed in their proper sequence or order without knowing their age in years.
Term
Law of superposition
Definition
Layers of sedimentary rocks or lava flows the youngerst layer is on top, and the oldest is on the bottom (assuming that nothing has turned the layers upside down)

-Does not tell age
Term
Principle of fossil succession
Definition
states the fossil organisms succeed one anohter in a definite and determinable order, time perior can be recognized by it's fossil content
Term
Theory
Definition
Well-tested and widely accepted view that the scientific community agrees best explains certain observable facts.

After a Hypothesis has faced scrutiny and competing models have been eliminated it then is a Theory
Term
Paradigms
Definition
Theories with very high degree of confidence and widley documented

Example: Plate Tectonics
Term
Hydrosphere
Definition
(water) Is the dynamic mass of liquid that is continually on the move.
Term
Atmosphere
Definition
(air)Earth is surrounded by a life giving gaseous envelope called the atmosphere.

Gives us air and protects us from the sun rays
Term
Biosphere
Definition
Includes all life on earth
Term
Geosphere
Definition
Lying beneath the atomospere and the oceans is the solid earth, or geosphere. Surface-Center of the planet
Term
Earth System
Definition
Is all the spheres studied as a whole
Term
Solar Nebula Hypothesis
Definition
Bodies of our solar system evolved from an enormous rotating cloud
Term
What are the sources of energy that drive the earth system?
Definition
1. Sun
2. Earth's Interior
3. Gravity
Term
When did the Big bang happen?
Definition
14 billion year ago
Term
Name and Describe the 4 layers of the earth
Definition
Crust- Thin layer outer skin, soild rocky
Mantle - 82 percent of the earth, soild rock shell
outer core- Liquid layer
Inner Core- solid, stronger than outer core
Term
Plate Tectonics
Definition
Earths rigid outer shell (lithosphere) is broken inot nemerous slabs calle plates, which are in contiual motion (continents move apart 2 inches per year)
Term
Mineral
Definition
Natually occuring inorganic soild that possesses an orderly crytalline structure and a definite chemical compostion.
Term
Rock
Definition
Is any solid mass of mineral, or mineral like, matter that occurs naturally as part of our planet
Term
Atomic Number
Definition
Same as the number of protons
Term
Mass Number
Definition
Neutrons + protons= mass number
Term
Isotopes
Definition
Atoms with the same number of protons but different number of neutrons
Term
Luster
Definition
Metalic vs Non metalic: wether it's shiny or not
Term
What Eight Elements make up_______% of the Earth?
Definition
Oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium make up 98 percent of the earth
Term
Name the 3 common radioactive decays
Definition
1. Emission of Alpha particles from neucleus
2. Emission of Beta particles( or electrons) from nucleus
3. Capture of electrons by the nucleus
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