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| The hardened remains or imprint of a plant or animal that lived long ago |
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| a fossil of an organism that was common, lived in many areas, and existed only during a certain span of time. |
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| a tubular sample that shows the layers of snow and once that have built up over the years |
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the age of an event or object in relation to other events or objects |
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[image]Law of Superposition |
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Definition
| the layers get older the deeper you get |
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| buried erosion surface separating two rock masses or strata of different ages |
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| breaking down of Earth's rocks, soils and minerals through direct contact with the planet's atmosphere |
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| reactions that act on rocks exposed to water and the atmosphere so as to change their unstable mineral components to more stable forms |
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| the actual age in years of an event or object |
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| the length of time it takes for half of the atoms in a sample of a radioactive element to decay into atoms of another element |
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| a theory stating that processes shaping Earth today, such as erosion and deposition, also shaped Earth in the past, and that these processes cause large changes over geologic time. |
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[image]Geologic Time Scale |
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Definition
| to describe the timing and relationships between events that have occurred during the history of the Earth |
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| one of several periods in Earth's history when large numbers of speices became extinct at nearly the same time |
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| the process through which members of a species that are best sutied to their enviroment survive and reproduce at a higher rate than other members of the species |
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Definition
| a change or adjustment in an animal or plant that increases its chance of survival in a specific environment. |
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