Sulfide

The rotting leaves produced large quantities of hydrogen sulfide, a toxic gas.

The action of oil and natural gas created hydrogen sulfide in the limestone. The hydrogen sulfide reacted with oxygen in rainwater moving through the rock. Sulfuric acid developed. The acid created the caves by dissolving the limestone in its path.

Newmont Mining Corp's Yanacocha sulfides project to expand gold production in Peru has been delayed and will only be developed "at the pace the pandemic allows," CEO Tom Palmer said on Wednesday at an industry conference.

By analysing data from the James Webb Space Telescope, the researchers found evidence of dimethyl sulfide and dimethyl disulfide in the atmosphere of the planet known as K2-18b. The planet is 124 light-years away; one light-year is equivalent to nearly 6 trillion miles.