Desertification Refers to the
A) Formation of Deserts by Atmospheric $\degree$

Desertification refers to the

A) formation of deserts by atmospheric high pressure zones that are located 30 $\degree$ north and south of the equator.
B) displacement of local populations as the area of available land becomes insufficient to achieve food security.
C) seasonal hypoxic (low-oxygen) conditions in the Gulf of Mexico caused by synthetic fertilizers in agricultural runoff.
D) loss of more than 10% of land's productivity due to factors such as drought, extreme erosion, and soil infertility.