Test yourself on challenging hiking trails, explore mysterious sulfur hot springs and volcanic mud deposits and marvel at majestic jungle waterfalls. (reservaconchal.com)
It is often coated with lime mud deposits and can be rather hard to see. (AmbergrisCaye.com)
That plants like bryophytes influenced the formation of mud deposits long before roots appeared is a surprise, says geobiologist Woodward Fischer of Caltech who wrote a commentary about the study for the same issue of Science. (sciencenews.org)