Soil porosity, The total volume of soil occupied by soil pores., Soil air composition, 79% nitrogen, 20% oxygen, 1% carbon dioxide, Hygroscopic water, Thin film around soil particle, cannot be removed from plants and isn't available to plants, Gravitational water, Is moved through soil by gravity, Floculation, Clustering together of soil particles to create larger structures called floccules , Field capactity, Amount of water a soil contains after excess water is drained over a period of time, Chemical weathering, Breaking down of rocks chemically >:), Permanent wilting point, Minimum amount of water a plants needs to not wilt, Available water capacity, Amount of water a soil can hold to be used by plants , Separation, When soil aggregates separate in the soil , Cementation, The binding together of soils.

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