IB ESS HL 1.2.2 Systems Approach

Inputs:

Decomposition;
Infiltration of dissolved minerals / atmospheric deposition/precipitation;
Weathering of parent material / sedimentation from run-off / river flow;

Animal excretion;
Fertiliser use;
(Atmospheric/biological) nitrogen fixation;

Candidates may present their answers in the form of a diagram, but it is not necessary for full credit.
Award [1] for each correct input identified, up to [2 max].
Do not credit flows that are transfers or transformations within the soil eg ammonification / nitrification / capillary movement, etc.
Do not accept "pesticides" (these do not provide inorganic nutrients).

Outputs:

Candidates may present their answers in the form of a diagram, but it is not necessary for full credit.
Award [1] for each correct output identified, up to [2 max].
Do not credit flows that are transfers or transformations within the soil eg ammonification / nitrification / capillary movement, etc.