soil basics

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1. soil can be used as a sink because..

  • it is able to conver the soil into inert carbon which is easily and quickly put back into the atmosphere
  • it allows slow decomposition of soil carbon if it is not disturbed, this is through fauna respiring it and converting the rest into modified soil carbon - keeping the carbon from the atmosphere for a longer time. some carbon can be further decomopsed
  • it is ploughed so can move the carbon through the soil
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2. which of these is not a reason soil is important...

  • it stores water for plants to use
  • it directly feeds many organisms
  • it regulates water flow
  • its provides a good engineering medium for roads and buildings, etc.

3. how does water exist in soil

  • it doesn't
  • hydroscopic water, capillary water and available water
  • keeps air out
  • fills the pores

4. how does soil get its nutrients

  • from parent rock, the atmosphere and decomposers
  • from animals
  • from water

5. where does the soil store its nutrients

  • from air
  • from available water
  • from roots
  • from pores

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