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I've had my projector for about a month. It's looked fine to me ( I was just projecting it on a white sheet) but the other day I bought a projector screen. The image is much clearer and sharp but now I can see what I think is dust particles. It kind of bugs me when I watch movies and play video...

Wind is ______ effective at eroding and transporting materials than other geomorphic agents because its density is ______ that of other geomorphic agents. A. more; more B. more; less C. less; more D. less; less