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Usgs: What Is Geologic Time?

Curated by ACT

Understand the evidence for ancient earth and the geologic time scale. Learn on this site how the earth can help scientist date discoveries.

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Concepts
geologic time scale, relative dating, sediment
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Additional Tags
ancient earth, earth age, radiometric dates, cambrian strata, devonian strata, mississippian strata, pennsylvanian strata, us geological survey, usgs, usgs: what is geologic time?, earth's age
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Classroom Considerations
  • Knovation Readability Score: 3 (1 low difficulty, 5 high difficulty)
  • This resource is only available on an unencrypted HTTP website.It should be fine for general use, but don’t use it to share any personally identifiable information