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Course: Science — Third Preparatory
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Science — Third Preparatory

Science — Third Preparatory

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Science — Third Preparatory 2026/2027

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Unit 1 - Force, Motion, Acceleration and Physical Quantities

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Text lesson

Unit 4 — Dating Planet Earth

Science — Third Preparatory

Unit 4 — Dating Planet Earth

📌 Comprehensive Scientific Terminology & Definitions:

📌 Comprehensive Scientific Terminology & Definitions:

Comparison aspectMain ideaKeywords
Relative Dating (التأريخ النسبي للصخور)
  • Determining whether a rock layer
  • fossil
  • or geological event is older or younger than surrounding rocks without specifying numerical age in years
  • utilizing fundamental stratigraphical principles
Determiningwhetherrocklayer
Absolute / Radiometric Dating (التأريخ المطلق الإشعاعي)
  • Determining the precise numerical age of rocks or fossils in calendar years using the steady
  • constant rate of radioactive decay of unstable parent isotopes into stable daughter isotopes
Determiningprecisenumericalrocks
Law of Superposition (قانون تعاقب الطبقات)
  • In any undeformed sequence of sedimentary strata
  • the oldest layer is deposited at the bottom and layers become progressively younger toward the top
undeformedsequencesedimentarystrata
Comparison aspectMain ideaKeywords
Index Fossils (الحفريات المرشدة)
  • Fossils of organisms that lived during a short
  • well-defined geological time span
  • were geographically widespread
  • and existed in great abundance
  • used to date and correlate rock strata globally
organismslivedduringshort
Half-Life (فترة عمر النصف)
  • The constant time interval required for half of the unstable radioactive parent nuclei in a sample to spontaneously decay into stable daughter products (e.g
  • Carbon-14 half-life is 5
  • 730 years
  • Uranium-238 is 4.5 billion years)
constanttimeintervalrequired
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