Panorama from the Summit (4) - Sol 585

Greeley has calculated that if the number and frequency of DD Spirit has encountered are similarly spaced throughout Gusev Crater, the Crater probably experiences about 90.000 Dust Devils per Sol.
Collectively, the whirlwinds lift and redeposit an estimated 4,5 MKg (about 9,9 M-U.S.-pounds) of sediment per Sol.