Harmattan

From Quartz, the video of the day:

Scientists studied data collected by CALIPSO, which was launched in 2006 to study clouds and aerosols and gauge how they affect weather systems, and found that on average, a stunning 182 million tons of dust each year are blown past the western coast of Africa that bounds the Sahara. As the NASA Earth Science News Team points out, that’s enough dust to fill about 690,000 semi trucks. The dust then crosses the Atlantic ocean, where 27.7 million tons of it settle in the Amazon basin. [link]

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