Module 1 Geologic Time

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What is Geologic Time?

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Geologic Time is the timeline of Earth's history, divided into different periods based on significant geological and biological events.

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What is a sedimentary rock?

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Sedimentary rock is formed from the accumulation and compaction of mineral and organic particles, often in layers.

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What is an index fossil?

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An index fossil is a fossil that is used to define and identify a particular time period in the geologic time scale.

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What does the Law of Superposition state?

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The Law of Superposition states that in undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest are at the top.

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What is a trace fossil?

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A trace fossil is a type of fossil that provides evidence of the activity of ancient organisms, such as footprints or burrows.

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What is a mold fossil?

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A mold fossil is a cavity or impression in sediment that reflects the shape of an organism.

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What is a cast fossil?

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A cast fossil is formed when a mold fossil is filled with minerals or sediments, creating a replica of the original organism.

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What can fossils tell us about Earth's past?

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Fossils provide evidence of past life, environments, and changes in Earth's climate and geography.

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What is the significance of finding fossils in a desert?

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Finding fossils in a desert may indicate that the area was once covered by water, as many fossils are from aquatic organisms.

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What is permineralization?

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Permineralization is a process where minerals fill the pores of organic material, turning it into fossilized remains.