Earth History, Science

Topics: Geology, Fossil, Paleontology Pages: 3 (638 words) Published: May 1, 2013
Kade Hutchison
Block One
Chapter 8: Earth History
uniformitarianism:
The idea that the same geological process that happens today has been around forever. Uniformitarianism is believed by many scientist.
catastrophism:
is the idea that geologic change happens suddenly
The meteor hitting the earth was a huge catastrophism
paleontology:
The study of plant and animal fossils.
Through the study of paleontology we have learned many things about plants. relative dating:
Relative dating is a way to determine the age of a fossil.
Relative dating was used in the findings of many fossils.
sedimentary rock:
rock formed from consolidated clay sediments.
Sedimentary rocks are found all over the world.
superposition:
Involves rocks and there ages. Which one is older and which is not. The scientist used superposition to determine which layers of rocks came first. unconformity:
a break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time Unconformities can be split into two using the law of crosscutting relationships. Crosscutting relationships

the principle that a fault or body of rock is younger than any other body of rock that it cuts through An example of the law of crosscutting relationships would be when a fault splits. absolute dating:

any method of measuring the age of an event or object in years There are many different methods used in absolute dating.
radioactive decay:
the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation. radiometric dating
a method of determining the age of an object
Radiometric dating is an intricate technique to determine the age of a particular thing. half-life
the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance... The elimination half-life varies from about 1 to 4 hours.

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