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REVIEW UNIT 3+4

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  • What happen when plants or animals die?
    They decompose into humus.
  • If we do something that society does not ..............., that can bring bad consequences.
    permit
  • What are things that make up soil?
    weathered rock, humus, minerals, air, and water
  • We should think of others before we do something. Our actions have ..................... .
    consequences
  • How many main layers of soil are there?
    There are 3 main layers of soil: the top layer, the middle layer, and the bottom layer.
  • We shouldn't love and respect others, ourr society will be a happier place to live in. TRUE OR FALSE?
    FALSE. We should love and respect others, ourr society will be a happier place to live in.
  • Grains ............ in a pile, and when mixed with ............, they become soil.
    collect - humus
  • What happen when animals dig into the soil?
    They move humus down.
  • When rocks are weathered, they ................. into smaller pieces.
    break down
  • Humus is rich in ................. that plants use to grow.
    nutrients
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