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Geology 115
Chapter 1 (Introduction)
25
Geology
Undergraduate 1
10/01/2007

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Term
Geology
Definition
the scientific study of earth.
Term
Atmosphere
Definition
gases that envelop the earth.
Term
Hydrosphere
Definition
the water on or near Earth's surface.
Term
Biosphere
Definition
all of the living or once-living material on earth.
Term
Geosphere or Solid Earth system
Definition
rock and other inorganic Earth material that make up the bulk of the planet.
Term
Physical Geology
Definition
the division of geology that is concerned with Earth materials, changes in the surface and interior of the Earth, and the dynamic forces that cause those changes
Term
Two major crusts
Definition
Oceanic and Continental
Term
Lithosphere
Definition
the crust and the uppermost part of the mantle.
Term
Asthenosphere
Definition
the uppermost mantle underlying the lithosphere.
Term
Tectonic Forces
Definition
the forces generated inside the Earth, causing deformation of rock as well as vertical and horizontal movement of the earth.
Term
Plate tectonics
Definition
the lithosphere as broken into plates that are in motion.
Term
Divergent Boundary
Definition
tow plates that are moving apart from each other.
Term
Mid-oceanic Ridges
Definition
crests of submarine mountain ranges created by divergent boundaries.
Term
Magma
Definition
molten rock.
Term
Igneous rock
Definition
rock that forms when magma solidifies.
Term
Convergent Boundaries
Definition
plates move toward each other.
Term
Ocean-Continent Convergence
Definition
the continental crust will rise above the oceanic crust.
Term
Subduction Zone
Definition
a zone where an oceanic plate descends into the mantle beneath an overriding plate.
Term
Metamorphic Rock
Definition
hot rock, under high pressure, near the subduction zone that does not melt.
Term
Ocean-Ocean Convergance
Definition
the denser plate will subduct beneath the less-dense plate.
Term
Transform Boundaries
Definition
occurs where two plates slide horizontally past each other.
Term
Isostatic Adjustment
Definition
vertical movement of sections of Earth's crust to achieve balance.
Term
Equilibrium
Definition
Earth's surface adjusted to the physical and chemical conditions of their environment.
Term
Sediment
Definition
the product of the breakdown of rock.
Term
Sedimentry Rock
Definition
cemented or otherwise consolidated rock.
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