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100
Ex. of catastrophism
What an asteroid impact?
100
Principle stating that younger rocks lie above older rocksin an undisturbed sequence?
What is the law of superposition?
100
Radioactive isotypes tend to break down into stable isotopes in a process called
What is radioactive decay
100
What is currently the North Star
What is polaris
100
Death of every member of a species
What is extinction
200
Definition of catastrophism
What is the principle stating that geologic change occurs suddenly?
200
The history if the Earth would be incomplete without knowledge of the organisms athat have inhabited our planet and the __________ _____ _____ ____ _____.
What is conditions under which they lived?
200
If a isotopes is unstable it can also be called
What is radioactive
200
Earth is tilted at its axis at _____ degrees
What is 23.5
200
Largest division of geologic time
What is eon
300
Definition of fossil
What is a remain of an organism preserved by geologic processes?
300
Name the four geological disturbances
What is faulting, intrusion, folding, tilting
300
Atoms of the same element have same number of protons but different numbers of neutrons are called....?
What is isotopes
300
What principle is like the geologic column
What is superposition
300
Mark or cavity made in a sedimentary surface by shell or other body
What is mold
400
Geologists have a similar ____ when investigating the Earth.
What is goal?
400
Break in earth's crust along with blocks of crust's slide relative to one another
What is faulting
400
Internal forces slant rock layers
What is tilting
400
Arrangement of rock layers in which oldest rocks are at the bottom
What is geologic column
400
Unit of geologic time including 2 or more periods
What is era
500
The study of fossils is _______________.
What is paleontology?
500
Molten rock from earths interior that squeezes to rock and cools
What is intrusion
500
Rock layers bend and buckle from earth's internal forces
What is folding
500
To determine______ age of fossils and rocks! scientists analyze isotopes of radioactive elements
What is absolute
500
Subdivision of a geologic period
What is epoch
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