Question

decline in the productivity of cultivated land or forest land

Answer 1

Land degradation is the method of degeneration of soil or loss of productivity of the soil. Natural hazards are the circumstances of the physical environment which drive to the occurrence of a high degeneration possibility, for example, the precipitous slopes as a danger for water depletion.

It can also leads to a deterioration in productivity and can make land to become inappropriate for farming. For Example, in the USA alone,  50 million hectares of agriculture land and pasturage is influenced by salinity, and the plot of land is highly affected nearly to 10% yearly.