Mercury's surface in "enhanced color," a color scheme created to emphasize color differences. This is not what Mercury would look like to the human eye, but by applying mathematical analysis to images, color differences can be accentuated beyond those visible to a person.
Mount Rushmore National Memorial under construction.
The workers had to endure conditions that varied from blazing hot to bitterly cold and windy. Each day they climbed 700 stairs to the top of the mountain to punch-in on the time clock. Then 3/8 inch thick steel cables lowered them over the front of the 500-foot face of the mountain in a "bosun chair." Despite the dangers, no one was killed during the project.
Otters in Glacier Bay National Park and Preserve, Alaska.
The sea otter population of Glacier Bay has increased dramatically in the past 20 years. Ecologists consider sea otters a keystone species here. Otters consume vast quantities of clams, urchins, crabs, and other invertebrates and their presence creates ripples through the ecosystem. NPS photo.
Every day someone like you becomes a wildland wildfire fighter, a teacher, a trail-builder, a museum curator, or a park ranger. Discover your opportunities in national parks. Come to play. Come to learn. Come to serve. Develop your environmental leadership skills. Find a job. Be the next generation to preserve and protect these great places.
With more than 80% of Americans living in urban areas, urban parks are more important than ever. The father of American landscape architecture, Frederick Law Olmsted, said of urban parks:
It is one great purpose of the Park to supply to the hundreds of thousands of tired workers, who have no opportunity to spend their summers in the country, a specimen of God's handiwork that shall be to them, inexpensively, what a month or two in the White Mountains or the Adirondacks is, at great cost, to those in easier circumstances.
DOINews: NPS: Grand Canyon Fills with Sea of Clouds
A rare ground inversion last Thursday filled the Grand Canyon from rim to rim with a sea of clouds.
Clouds fill the Grand Canyon from rim to rim on Thursday, Dec. 11, 2014. Photo by Maci MacPherson, NPS.
Ground inversions at Grand Canyon are a sight to behold – clouds fill the canyon with sunny, blue skies above the rims. The topography of Grand Canyon enhances the effect of inversions, creating the dramatic views of a sea of fog and clouds seemingly dense enough to walk out on.
Ground inversions occur when cold air is trapped by a layer of warm air. On clear, cold nights ground temperatures cool rapidly. Air in contact with cold surfaces cools and sinks. At Grand Canyon cold, moist air drops into the canyon forming cascading “waterfalls” of clouds pouring down the rim filling the canyon. Warm air above the rim holds the clouds in place until enough solar radiation is received to warm the surface of the rocks, heating the cold, dense clouds in the canyon and causing them to rise.
Visitors at Grand Canyon during an inversion are challenged to be patient. Waiting out the warming process is well worth the effort; when the clouds start to lift the currents of air swirl and turn on themselves parting like curtains to reveal bursts of color and light, a breathtaking spectacle.