Geo: All

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What is the geological time scale?

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A system of chronological dating that relates geological strata to time, used by geologists and other Earth scientists to describe the timing and relationships of events in Earth's history.

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NGSS.MS-ESS1-4

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What is a fossil?

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The preserved remains or traces of a once-living organism, often found in sedimentary rock.

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NGSS.MS-LS4-1

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What is the principle of superposition?

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In undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest layers are at the top.

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NGSS.MS-ESS1-4

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What is radiometric dating?

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A method used to date materials such as rocks or carbon by comparing the relative abundance of radioactive isotopes and their decay products.

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NGSS.HS-ESS1-5

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What is Carbon-14 dating?

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A radiometric dating method used to determine the age of organic materials by measuring the amount of Carbon-14 remaining.

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What is Uranium-238 dating?

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A radiometric dating method used to date rocks and minerals by measuring the decay of Uranium-238 to Lead-206.

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NGSS.HS-PS1-8

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What are sedimentary rocks?

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Rocks formed by the accumulation and compaction of mineral and organic particles, often containing fossils.

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NGSS.MS-ESS1-4

NGSS.MS-ESS2-1

NGSS.MS-ESS2-3

NGSS.MS-LS4-1

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What is the fossil record?

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The total number of fossils that have been discovered, as well as the information derived from them, which provides evidence of past life.

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NGSS.MS-LS4-1

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What is the significance of the fossil record in geology?

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It helps scientists understand the history of life on Earth, including the evolution of species and changes in environments over time.

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NGSS.MS-LS4-1

NGSS.MS-LS4-2

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What is a rock unit?

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A body of rock with a recognizable and consistent set of characteristics, often used in geological mapping.

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NGSS.MS-ESS1-4