By dust I mean fine particulate matter, and I'm interested in natural sources, here on Earth, but also on the Moon, Venus (if there is any), Mars, etc.
Focusing on the main sources, both immediate and indirect. And ignoring "water dust" (i.e. snow and ice), at least here on Earth.
My guess is that the main immediate sources are soil, sandy deserts, and sandy beaches. With volcanoes an important, but not major, source. Micrometeorites, salt spray, and no doubt many others are minor sources. The purely geological processes involved (i.e. ignoring the organic ones which are essential for the creation of soil; I'm interested in those which apply beyond the Earth) are thus water, ice, and wind erosion (probably in that order).
On the Moon, there's surely a lot of dust from ancient volcanoes and large impacts, but in recent times (i.e. the last ~3 billion years) it's the result of micrometeorites and their impacts. Similarly for Mercury.
On Mars?
On Venus??
Focusing on the main sources, both immediate and indirect. And ignoring "water dust" (i.e. snow and ice), at least here on Earth.
My guess is that the main immediate sources are soil, sandy deserts, and sandy beaches. With volcanoes an important, but not major, source. Micrometeorites, salt spray, and no doubt many others are minor sources. The purely geological processes involved (i.e. ignoring the organic ones which are essential for the creation of soil; I'm interested in those which apply beyond the Earth) are thus water, ice, and wind erosion (probably in that order).
On the Moon, there's surely a lot of dust from ancient volcanoes and large impacts, but in recent times (i.e. the last ~3 billion years) it's the result of micrometeorites and their impacts. Similarly for Mercury.
On Mars?
On Venus??
via International Skeptics Forum https://ift.tt/2JYipfK
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