A newly formed thermal feature has violently erupted into life in Yellowstone National Park, forcing park rangers to close off a section nearby after it showered the boardwalk with a blistering mixture of water, soil and sinter — mineral deposits that are precipitated from hot springs.
And in a further sign that the park's hydrothermal systems are acting up, geysers that have been inactive for five years are warming up and throwing scalding water around.
