Part one of term paper
Salinity in both the rivers and on the land is one of the main and most costly results of overclearing and irrigation. Salinity is caused by changes in the delicate balance between surface water and groundwater systems. A small increase in the infiltration of water from the topsoil to the groundwater, due to rainfall or irrigation, can result ...

Part two of term paper
... the evaporation from their leaves. With those pumps gone, excess rainfall accumulates underground and watertables rise to the surface, bringing ancient sediments of salt with them, often in heavy concentrations. Once exposed to the air and sun, the salts become even more concentrated due to evaporation, leaving a white crust of salt crystals on the land. Most plants cannot tolerate the scalding chemical effect of the salt, and so they die. As they die off, the soil succumbs to erosion and a dou ...