The Amazonian rainforest depends on Saharan dust for many of its nutrients, including iron and phosphorus.* "If it weren't for those nutrients, the Amazon would be a wet desert," says Ilan Koren, an atmospheric scientist at the Weizmann Institute in Rehovot, Israel.Note: this topic is from two years ago -- 2006.
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For contrast, what blows out of Washington DC won’t grow ANYTHING worthwhile.
So what’s a wet desert like? My imagination is failing me. Maybe something like Arctic tundra?