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8th grade · Science · Unit 9 of 9

Earth's History & Fossils

Rock strata, the geologic time scale and evidence of evolution.

What your child practices

Practices how rock layers are used to build Earth's 4.6-billion-year history, patterns in the fossil record, and anatomical and embryo evidence that living things share ancestors.

Washington State Learning Standards learning standard: MS-ESS1-4; MS-LS4-1; MS-LS4-2 · rock strata and Earth's history, the fossil record, and anatomical evidence of common ancestry

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    The geologic time scale divides Earth's history by…

    • calendar years
    • seasons
    • presidents
    • major events in the rock and fossil record

  2. Question 2

    Most of Earth's history took place in the…

    • Precambrian
    • Cenozoic
    • Mesozoic
    • Jurassic

  3. Question 3

    Earth is about how old?

    • 1 million years
    • 100 years
    • 6000 years
    • 4.6 billion years

  4. Question 4

    Dinosaurs (other than birds) went extinct about…

    • 10,000 years ago
    • 1 billion years ago
    • last century
    • 66 million years ago

  5. Question 5

    Which era is called the Age of Dinosaurs?

    • Precambrian
    • Mesozoic
    • Paleozoic
    • Cenozoic

  6. Question 6

    Why are relative ages useful even without exact dates?

    • They predict weather
    • They give exact years
    • They show color
    • They show the order of events

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