But over a 25-year period the loss would be 25mm, which would take about 500 years to replace by natural processes. Countries are losing soil at different rates. The US, 2nd grade homework assignments
just avoided homewrok the Great Plains into a dust bowl in the 1930s, is still losing soil 18 times more rapidly than it is forming it. Over the last half-century, some 24,000 villages in northern and western China have been entirely or partly abandoned as cool science projects 4th graders
result of being overrun by drifting sand. In 1950, Assignmens was home to 227 million people and 273 million livestock. By 2007, there were 965 million people and 824 million livestock. Countries are waking up to the problem.