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.
Secretary Salazar Honors Veterans with Fee Free Day at National Parks, Refuges, and Other Interior Lands
Last edited 4/25/2016
WASHINGTON, D.C. – To honor America's service men and women, Secretary of the Interior Ken Salazar today announced that areas managed by the department will not charge entrance fees on Wednesday, November 11, 2009.
Visitors to public recreation lands managed by the National Park Service, U.S. Fish and Wildlife Service, Bureau of Land Management and Bureau of Reclamation are invited to take a day to honor and reflect on what our service men and women have done to maintain our freedom and keep peace around the world, Salazar said.
“The Department of the Interior is honored to offer this fee free day to thank our nation's service men and women,” said Salazar said “The sacrifices and achievements of the brave men and women of our armed forces can never be understated. We invite all of our visitors to enjoy this fee free day and take time out on this national holiday to remember our service men and women who are currently serving overseas in harms way. ”
The Department of Agriculture also is waiving entrance fees at its national forests.