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2nd grade · Science · Unit 6 of 9

Fast & Slow Earth Changes

Volcanoes in a day, canyons over ages.

What your child practices

Practices sorting Earth events into fast ones (eruptions, landslides, floods) and slow ones (erosion, carving canyons), and comparing ways people slow wind and water from changing land.

California Content Standards learning standard: 2-ESS1-1; 2-ESS2-1 · Earth events happen quickly or slowly, and ways to stop wind and water from changing land

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

    Which change happens slowly?

    • An earthquake
    • A river carving a canyon
    • A landslide
    • A flash flood

  2. Question 2

    Lava from a volcano cools into new rock in days. This is…

    • no change
    • millions of years
    • slow
    • fast

  3. Question 3

    Wind blows sand away bit by bit. This is…

    • fast
    • never happening
    • instant
    • slow

  4. Question 4

    Sand dunes move a little each year. This is…

    • fast
    • slow
    • frozen
    • instant

  5. Question 5

    Which takes the longest?

    • A landslide
    • A canyon forming
    • An eruption
    • A flood

  6. Question 6

    The Grand Canyon formed because a river cut rock for…

    • one hour
    • one day
    • one week
    • millions of years

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