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Midterm
Geology Exam 2
31
Geology
Undergraduate 1
10/13/2010

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Term
Isotope
Definition
Atoms of the same element with varied number of neutrons
Term
How does an ionic bond work?
Definition
form because of an attraction between negatively and positively charged ions. Example, Sodium Chloride (NaCl)
Term
Metallic bonds
Definition
bonds that form between metals. Electrons are shared by all atoms of the sold. IE Gold.
Term
Why are sulfide minerals an environmental hazard?
Definition
ecause they can be associated with environmental degradation. The exposed sulfides oxidize in the presence of water to form compounds that may enter and pollute streams and other environments.
Term
Intrusive igneous rock0
Definition
crystallized/solidified beneath the Earth's crust
Term
Extrusive igneous rocks-
Definition
Solidified/crystallized at or near the earth's crust
Term
Detrital Sedimentary Rocks
Definition
classified according to their grain size as either shale, siltstone, sandstone, or conglomerate.
Term
Chemical Sedimentary Rocks
Definition
- classified according to their mineral composition. Include halite, gypsum, and limestone
Term
What happens when we have plastic deformation?
Definition
The material does not return to it's original state after stress is removed. Characterized by permanent change.
Term
Joint
Definition
fracture along which no displacement occurs
Term
Fault
Definition
fracture along which displacement has occured
Term
unconformity
Definition
a significant break or gap in the geologic record. A time when erosion rather than deposition occurred. They are often a natural boundary between two rock types with different characteristics.
Term
What stress causes a rock to fold?
Definition
Lateral compression
Term
Limestone
Definition
a carbonate rock that begins dissolving in mild acid.
Term
Grain size in intrusive igneous rock?
Definition
phenocrysts which are large enough to be seen by the naked eye
Term
Species
Definition
a group of individuals capable of interbreeding
Term
Species
Definition
a group of individuals capable of interbreeding
Term
Indigenous Ecosystem
Definition
ecosystem as the result of completely natural evolutional processes, rarely exist.
Term
Why are there more tree species in the West than there are in the East?
Definition
Because the mountains in the west go north to south while those in the east go east to west
Term
Keystone Species
Definition
exert strong community effects disproportionate to their abundance
Term
Key to everglades restoration?
Definition
Population control
Term
Tree roots can prevent landslide?
Definition
true
Term
Disturbances in the ecosystem can increase biodiversity.
Definition
True
Term
Seawalls decrease biodiversity.
Definition
True
Term
The most abundant mineral?
Definition
Quartz
Term
The Law of Superposition
Definition
for any sequence of sedimentary strata that has not been overturned, the youngest rocks are at the top and the oldest at the bottom or base of the sedimentary sequence. For any given strata or sedimentary unit, rocks above are younger and those below are older.
Term
Ecological Restoration
Definition
Application of ecology to restore eco-systems such as ricers, wetlands, beaches, or sand dunes that have been degraded. Also the restoration of land following activities such as mining and timber harvesting.
Term
Introduction of exotic species decreases biodiversity.
Definition
True
Term
Low grade metamorphic rock.
Definition
Slate
Term
Ductile
Definition
materials that rupture after considerable plastic deformation
Term
Law of Crosscutting relationships
Definition
Fundamental law of geology that states hat a rock is younger than any rock it cuts across, assists in determining the relative age of rocks.
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