Here is my photograph for the « The Earth Science Week 2019 photography competition » organized by the Geological Society. https://www.geolsoc.org.uk/photocompetition

Photography of Mammoth Hot Springs – Yellowstone National Park – Wyoming – USA – May 2005

by Olivier Pourret

Travertine formations grow rapidly due to the soft nature of limestone. As hot water rises through limestone, large quantities of rock are dissolved by the hot water, and a white chalky mineral is deposited on the surface.