It takes thousands of years for rainwater to seep deep underground, warm up, and return to the surface before bathers can enjoy it in Arkansas.
Published Apr 23, 2014Yellowstone National Park’s Old Faithful Geyser erupts so reliably—every hour on the hour—you can set your watch by it. So goes the legend, but it’s not true.
Published Nov 30, 2008Landsat instruments have peered into the hot-water plumbing beneath some of the park’s famous monuments.
Published Dec 8, 2011This astronaut photograph is centered on Yellowstone Lake, a popular camping and fishing location within the National Park. The lake basin includes part of the youngest caldera and has an area of 352 square kilometers (136 square miles).
Published Sep 5, 2005Established in 1872, it was the first national park in the United States, and perhaps the world. Its geological and biological wonders have led international groups to declare it a world heritage site and a biosphere reserve.
Published Apr 17, 2016A long, active geologic history sculpted the surface features visible today in the Teton mountain range and Jackson Hole valley.
Published Apr 10, 2016Mexico’s Cuatro Ciénegas Basin is one of the best places on Earth to investigate what life might have looked like on Mars.
Published Feb 23, 2013In National Parks across the United States, recent springs are among the earliest ever observed compared to the past 112 years.
Published Apr 6, 2018A bounty of marine life thrives within the shoals and seagrass beds of the park.
Published Apr 18, 2020Ash, pumice, and steam shaped the landscape around Katmai and Novarupta.
Published Oct 27, 2019Researchers are using satellite data to measure lake water quality and clarity of the lakes in the Upper Midwest.
Published Mar 16, 2002Americans celebrate the 75th anniversary of Shenandoah National Park, just 75 miles from Washington, DC, but worlds away in spirit.
Published Jun 25, 2011