The O Horizon: Organic Layer Dynamics Exercise

The O Horizon: Organic Layer Dynamics

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The O Horizon: Organic Layer Dynamics

Study the O horizon, the organic layer located at the top of the soil profile. Learn about its composition and dynamic role in ecosystems.

Questions

  1. MultiChoice

    What is the primary material component of the O horizon?

  2. MultiChoice

    Where is the O horizon located in a soil profile?

  3. MultiChoice

    What gives the O horizon its dark brown or black color?

  4. MultiChoice

    In which biome would you expect to find the thickest O horizon?

  5. MultiChoice

    Which organisms are essential for breaking leaf litter down into humus in the O horizon?

  6. MultiChoice

    Why is an O horizon rare or very thin in desert soils?

  7. MultiChoice

    What main benefit does the O horizon offer to underlying soil layers?

  8. MultiChoice

    What is leaf litter in the O horizon?

  9. MultiChoice

    How does warm temperature affect organic decomposition in the O horizon?

  10. MultiChoice

    How does a thick O horizon help prevent soil erosion?

  11. MultiChoice

    Which organism burrows between layers and mixes O horizon material into the A horizon?

  12. MultiChoice

    What does humus in the O horizon store effectively for plant growth?