30 terms

Ch. 6 Test Ruda

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extinction
death of a species
4 ways rock layers are disturbed
fold, fault, tilt, and intrusion
half life
amount of time it takes for 1/2 of radioactive atoms to decay
uniformitarianism
geologic processes operate today as they did in Earth's past
relative dating
involves the comparison of one rock layer with others in a sequence to determine age
eon
the largest of divisions of geologic time
rocks and fossils
scientists study these to learn about Earth's history
Mesozoic Era
Age of Reptiles
Cenozoic Era
began 65 million years ago
amber
most fossils are preserved inside
absolute dating
the process of establishing the age of an object by determining the number of years it has existed
Law of Superposition
"younger over older" rock layers
4.6 billion years
amount of years geologists have studied Earth
eon
largest time period
relative dating
the process involving the comparison of rock layers with others in a sequence to determine its age
Cenozoic
time period we live in
Paleozoic
the Era that ended with the largest mass extinction in Earth's history
trace fossil
preserved footprint is an example
amber
hardened tree sap
disconformity
the most common type of unconformity
oldest rocks on bottom
how rocks layers are arranged in the geologic column
paleontologist
scientist that studies the history of plants and animals
catastrophism
the principle that states that geologic change happens suddenly
folding
rock layers bending and buckling
fault
a break in Earth's crust
tilt
rock layers slant by Earth's forces but without folding
intrusion
molten rock that has squeezed into existing rock
unconformity
when a layer or several layers of rock are missing form a rock-layer sequence
mold
a cavity where an animal or plant was buried
cast
an object created when sediment fills a mold and becomes a rock
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