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 the Law of Superposition?

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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 layers are at the top.

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What are fossils?

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Fossils are the preserved remains or traces of ancient organisms, often found in sedimentary rock.

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What is sedimentary rock?

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Sedimentary rock is formed from the accumulation of sediment, which can include minerals, organic matter, and other materials.

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What does extinction mean?

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Extinction is the end of an organism or a group of organisms, meaning that no living members of that species exist anymore.

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What is a trilobite?

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A trilobite is an extinct marine arthropod that lived during the Paleozoic era, known for its distinctive three-lobed body.

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What is the significance of the Archaeopteryx?

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The Archaeopteryx is a transitional fossil that shows characteristics of both dinosaurs and modern birds, providing evidence for the evolution of birds.

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What are environmental changes?

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Environmental changes refer to alterations in the ecosystem, such as climate change, that can affect the survival of species.

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What is a geologic era?

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A geologic era is a major division of geological time, characterized by significant events in Earth's history, such as mass extinctions.

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What is the difference between relative dating and absolute dating?

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Relative dating determines the age of rocks and fossils in relation to one another, while absolute dating provides a specific age using methods like radiometric dating.