What is permeability, which controls the movement of water through soil?

Correct answer: The ability of rock or soil to allow water to pass through it

Correct answer: B. Permeability is the capacity of soil or rock to allow water to pass through connected spaces or pores. After rain reaches the ground, some water infiltrates into the soil. If the pores are sufficiently connected, water can move downward or sideways easily; such material has high permeability. Coarse sand and fractured rock generally allow easier movement than very compact clay, although pore size and connection both matter. A, the colour of water, gives no information about pathways through soil. C, soil weight, is not the definition of permeability. D, evaporation is the change of liquid water into vapour at a surface and is a different process. Do not confuse porosity with permeability: porosity is the amount of empty space, whereas permeability concerns how easily those spaces are connected for water movement.