A lack of water and soil resources was implicated in the downfall of the Maya.
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Q17: Soil is the layer of sediment that
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
Q23: Actual evapotranspiration is the amount of water
Q24: Potential evapotranspiration is the amount of water
Q25: Soil erosion by wind removes particles of
Q26: Sand has high porosity and high permeability.
Q27: Water enters an aquifer through groundwater discharge.
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