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Rock layers

4th grade (Year 5 in England) · 10 questions · Common Core: NGSS.4-ESS1-1 · England: KS2 Y3 Rocks, KS3 Chemistry: Earth and atmosphere (rock cycle)

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  1. Question 1

    At the bottom of a lake, mud builds up about 2 cm every 100 years. A layer of mud is 14 cm thick. About how many years did it take to form?

    Answer

  2. Question 2

    Why might an old layer be found ABOVE a younger one?

    • A. Old layers float.
    • B. The bottom layer is always youngest.
    • C. Earth movements folded or flipped the layers.
    • D. Someone carried it there.

  3. Question 3

    At the bottom of a lake, mud builds up about 2 cm every 100 years. A layer of mud is 18 cm thick. About how many years did it take to form?

    Answer

  4. Question 4

    A rock layer contains rounded pebbles and fossil river snails. What was the environment when it formed?

    • A. a desert with no water
    • B. a glacier
    • C. the deep ocean floor
    • D. a river

  5. Question 5

    At the bottom of a lake, mud builds up about 1 cm every 100 years. A layer of mud is 8 cm thick. About how many years did it take to form?

    Answer

  6. Question 6

    Why might an old layer be found ABOVE a younger one?

    • A. Earth movements folded or flipped the layers.
    • B. The bottom layer is always youngest.
    • C. Someone carried it there.
    • D. Old layers float.

  7. Question 7

    At the bottom of a lake, mud builds up about 1 cm every 100 years. A layer of mud is 9 cm thick. About how many years did it take to form?

    Answer

  8. Question 8

    A river has cut a canyon and you can see many layers in the walls. What do the layers show?

    • A. paint added by people
    • B. one year of weather
    • C. the river's colour
    • D. a record of how the area changed over a very long time

  9. Question 9

    At the bottom of a lake, mud builds up about 1 cm every 100 years. A layer of mud is 10 cm thick. About how many years did it take to form?

    Answer

  10. Question 10

    Why might an old layer be found ABOVE a younger one?

    • A. Old layers float.
    • B. The bottom layer is always youngest.
    • C. Someone carried it there.
    • D. Earth movements folded or flipped the layers.

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  1. 700
  2. Earth movements folded or flipped the layers.
  3. 900
  4. a river
  5. 800
  6. Earth movements folded or flipped the layers.
  7. 900
  8. a record of how the area changed over a very long time
  9. 1000
  10. Earth movements folded or flipped the layers.