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Zorluk: KolayEarth's History and Paleontology

Match each geological concept related to Earth's history with its correct definition.

  • Law of SuperpositionStates that in undisturbed sedimentary rock layers, older layers lie beneath younger layers
  • Index FossilThe remains of a widespread organism that existed for a short, specific geologic time span
  • Radiometric DatingDetermines the absolute numerical age of rocks by measuring radioactive isotope decay

Cevap

Law of Superposition matches the principle that undisturbed lower sedimentary layers are older than upper layers; Index Fossil matches the remains of a widespread organism that lived during a short geologic span; Radiometric Dating matches the method of finding absolute age through radioactive isotope decay.
Each geological term is paired with its core scientific principle: the Law of Superposition establishes relative layer sequence, index fossils establish biostratigraphic correlation across a specific era, and radiometric decay calculations yield numerical ages.

Adım Adım Çözüm

1
Identify the relative dating principle governing sedimentary layering
The Law of Superposition states that deeper undisturbed layers were deposited before the layers above them.
Sediments deposit horizontally under gravity over time.
2
Identify the tool used to date and correlate strata across distant regions
An Index Fossil provides a distinct biostratigraphic marker due to its wide distribution and short evolutionary lifespan.
Distinct time boundaries allow rock layers in different locations containing the same index fossil to be matched in age.
3
Identify the absolute dating method based on nuclear physics
Radiometric Dating uses fixed radioactive half-lives to determine exact rock ages in years.
Unstable isotopes decay at predictable, constant rates.

Anahtar Kavram

Geological dating methods and principles of relative and absolute time
Tahmini Süre:45s
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Earth's History and Paleontology

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