FLASHCARDS SC.7.E.6.4

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What is geologic time?

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The vast timescale over which Earth's physical and biological processes have occurred, spanning billions of years.

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How do fossils support the theory of Earth's evolution?

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Fossils show gradual changes in organisms over time, providing evidence of species adaptation and extinction.

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What is an example of a fossil that shows evolution?

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The Archaeopteryx fossil shows traits of both reptiles and birds, supporting theories of evolutionary transitions.

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How do rock layers provide evidence of Earth's changes?

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Different layers contain fossils and minerals that indicate past environments, climate shifts, and mass extinctions.

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What is radiometric dating, and how does it support geologic evolution?

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A technique that measures radioactive decay to determine the age of rocks, confirming Earth's age and history.

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How do plate tectonics contribute to Earth's evolution?

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The movement of Earth's plates causes mountains, earthquakes, and continental drift, shaping the planet over millions of years.

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What role does glaciation play in shaping Earth's surface?

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Ice ages carve landscapes, deposit sediments, and influence ocean levels, showing long-term climate changes.

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How do meteorite impacts provide evidence of geologic change?

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Large impacts, like the one that caused the extinction of the dinosaurs, leave geological traces of sudden planetary shifts.

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What evidence supports the idea that continents were once connected?

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Fossil distribution, matching rock formations, and the jigsaw-like fit of continents support the theory of Pangaea.

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Why is physical evidence important in understanding Earth's history?

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It provides tangible proof of processes like evolution, climate change, and geological transformations.