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Geol 105 Test 1
Earth as a system
26
Geology
Undergraduate 3
09/24/2008

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Term
Uniformitarianism
Definition
understanding that there are inviolable laws of nature that have not changed in the course of time
Term
ROck
Definition
aggregate of mineral grains
Term
Mneral
Definition
inorganic element or compund that is characterized by its chemical composition and internal structure
Term
Igneous rocks
Definition
cooling of magma
Term
Sedimentary rock
Definition
layered rocks that accumulate under the influence of gravity
Term
Metamorphic rocks
Definition
alteration of preexisting rocks at high temps and pressures
Term
Law of superposition
Definition
oldest strata lie at the bottom and sucessively higher strata are progressively younger
Term
Law of Horizontality
Definition
states that all strata are horizontal when they form or that almost all strata are initially more nearly horizontal than vertical
Term
Original lateral continuity
Definition
similiar rocks on opposite sides of a canyon were once connected
Term
Law of intrusive relationships
Definition
Principle that an intrusive igneous rock is always younger than the rock that it invades.
Term
Unconformity
Definition
an erosional surface between a group of strata and the rocks beneath them--- represents a time of erosion rather than deposition
Term
Angular unconformity
Definition
when a group of rocks has been tilted eroded and younger rocks have been deposited on top of them
Term
Disconformity
Definition
beds below an eroded surface are undisturbed, irregular surface between groups of beds- reveal a past episode of erosion
Term
Nonconformity
Definition
an unconformity in which bedded rocks lost on an eroded surface of igneous or metamorphic rock
Term
Fossils
Definition
remains or tangible evidence of ancient life found within rocks
Term
Lithosphere
Definition
brittle solid
Term
Astenosphere
Definition
plastic solid
Term
Taxon
Definition
a group of closely related organisms
a species is a ____
Term
Phylogeny
Definition
is a tree of life produced by evolutionary branching
Term
Six Kingdoms
Definition
Archaebacteria, eubacteria,protista, fungi. animalia, plantae
Term
Archaebacteria and Eubacteria
Definition
contain ___ which are prokaryotic differing from the other kingdoms or organisms in lacking a nucleus and other structures found in cells of eukaryotes
Term
Protista
Definition
single celled eukaryotes and fleshy algae
Term
Fungi
Definition
simple multicellular forms of life that absorb food from decaying dead organisms
Term
Plantae
Definition
Term
Permineralization
Definition
Petrified wood
Term
mold
Definition
space within a rock that is 3d negative imprint of the organic structure
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