Sulfur vents
At this sulfur vent in Lassen Volcanic National Park in northeastern California, the yellowish sulfur deposits are visible near the mouth of the vent.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Biogeochemical Cycles. October 17, 2013."
http://cnx.org/content/m44889/latest/Figure_46_03_11.jpg
OpenStax CNX
CC BY 3.0.
