Soil is the layer of sediment that has been modified by organisms and water, and is the region where plant roots extend.
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Q12: Groundwater supplies fluctuate relatively little compared to
Q13: All groundwater extraction in Saudi Arabia is
Q14: Soil color indicates what the soil is
Q15: In the Northern Hemisphere, north-facing slopes are
Q16: Aquifers form mostly in porous sediments and
Q18: Most aquifers are confined aquifers.
Q19: The best soils for agriculture have a
Q20: Clay has greater permeability than sand.
Q21: Healthy topsoil does not have bacteria living
Q22: A lack of water and soil resources
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