Evolution and Earth Science Concepts

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Theory

Back

An explanation supported by observations and/or experiments that can be used to explain related occurrences.

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Theories can be ______ as more evidence is found

Back

Changed/modified

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Theory of Evolution

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Gradual change in population over time.

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The age of the Earth

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About 5 billion years old.

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Fossils

Back

Any trace or remains of an organism that has been preserved by natural processes.

Front

Sedimentary rock

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Where fossils are found.

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Law of Superposition

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The oldest layers, those laid down first are at the bottom. The youngest or most recent, are at the top.

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Preserve specimen

Back

No oxygen = no bacteria = no decomposition.

Front

Examples for preserving specimen

Back

Tar, ice, amber (think about the mosquitos in the amber from the Jurassic Park movie).

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Trends shown by evolution

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Organisms change over time, life evolved from simple to complex forms, life went from unicellular to multicellular.