Atmospheric pressure also plays a role, being 91 times that of what it is here on Earth; and clouds of toxic vapor constantly rain sulfuric acid on the surface. (universetoday.com)
Hydrogen fluoride is a highly corrosive chemical that can produce toxic vapor clouds. (cnbc.com)
Previously, Tschinkel hypothesized that the bare patches were made by termite nests or toxic vapors from the ground, according to Stephanie Pappas of LiveScience. (businessinsider.com)