People contribute to changes in the Earth's physical condition.Through soil erosion and other degradation of grazing land,often at the hands of people,an estimated______________tons of topsoil is lost annually.

Question

Quizplus · Accepted Answer

According to the United Nations, an estimated 25 billion tons of topsoil is lost annually through soil erosion and other forms of degradation of grazing land.

People Contribute to Changes in the Earth's Physical Condition