If soil is aerated it always contains:

Erosion can be caused by:

The organic matter in nature produced by bacterial decay of plant and animal matter is kow as:

The BEST soil for growing crops contains:

Earthworms are important in soil because they do all of the following except

To be considered loam, soil must contain all of the following EXCEPT:

Soil will form most quickly in a climate that is:

In the process of soil formation, the parent rock or mineral influences all of the characteristics of the soil formed EXCEPT its:

Permafrost would most likely be found in the state of :

The WORST soil in whci to grow crops for many years is:

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