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20180929_sha_z03_024 ©NASA Earth/ZUMAPRESS.com/MAXPPP - September 29, 2018 - Greenland - Image 3 of 4. Dust is probably the last thing that comes to mind when you think about Greenland, an island mostly covered by ice.Though Greenland's dust events are nothing like the massive clouds of dust and sand that can darken skies over the Sahara Desert for days, winds in Greenland are occasionally strong enough to send plumes of sediment streaming from dried-out lakes, river valleys, and outwash plains along the coasts. The dust in Greenland is mainly glacial flour, a fine-grained silt formed by glaciers grinding and pulverizing rock.