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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

Common mistakes

Common mistakes

Comparison aspectMain ideaKeywords
Writing the units of the geologic time scale in the wrong order.
  • Remember: Eons (largest)
  • Eras
  • Periods
  • Epochs (smallest). A helpful phrase: "Every Elephant Pushes Eggs"
RememberEonslargestEras
Mixing up mold and cast.
  • The mold is the hollow impression
  • the cast is the solid copy that fills it
hollowimpressionsolidcopy
Thinking that analogous structures prove a common ancestor.
  • They do not
  • they show adaptation to similar functions. Homologous structures are the ones that point to a common ancestor
showadaptationsimilarfunctions
•
  • Saying that half of the sample disappears in one half-life and all of it in two. After two half-lives one quarter is left
  • not zero
  • the amount never reaches exactly zero but becomes too small to measure after many half-lives
Sayinghalfsampledisappears
•
  • Forgetting that a mass extinction is an event
  • not a cause of the appearance of new species. Mass extinctions remove many species
  • geographic isolation
  • mutation and natural selection explain the appearance of new species
Forgettingmassextinctionevent
Confusing the fossil record with the rock record.
  • The fossil record is all the fossils found
  • the rock record is the sequence of rock layers and formations. Scientists use both together
fossilsfoundsequencelayers
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