New research has found the first evidence that large rivers control desert sands and dust. But how exactly? First we need to know a little bit about loess.
Loess is a silt-sized sediment which is formed by the accumulation of wind-blown dust. Loess deposits may be very thick and often blankets
A new NASA study calculates that nearly 64 million tons of dust, pollution, and other tiny particles enter the atmosphere above North America from other continents each year, nearly as much as the 69 million tons of aerosols produced domestically through natural processes and human activities.