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How old is the Earth?
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Catastrophism
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Geologic Record (#1)

Terms and meanings

TermDefinition
How old is the Earth? 4.6 billion years old
Catastrophism theory that Earth's surface has been largely shaped by sudden, violent events
Examples of catastrophic events massive floods, super volcanoes, mega earthquakes
mass extinction when many species die out in a short period of time
Uniformitarianism theory that slow forces shaped Earth's surface over a LONG period of time
Examples of uniformitarianism wind and water erosion, glaciation, deposition of mud, lava cooling to rock
James Hutton Scientist who made uniformitarianism popular
Geologic Time Scale Earth's history divided by major events and changes on Earth
Trace Fossil A fossilized mark that is formed in soft sediment by the movement of an animal.
fossil The remains or physical evidence of an organism preserved by geological processes.
sedimentary rock Fossils are commonly preserved in what type of rock?
What parts of organisms are typically fossilized? Hard-parts -- like bones and shells
Index fossil Fossils that are used to date a layer of rock or other nearby fossils
Created by: user-1777860
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