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.
Salazar Announces Fee Free Days in Celebration Of America's Great Outdoors and Earth Day
Office of the Secretary
Last edited 4/25/2016
WASHINGTON – To mark the 40th Anniversary of Earth Day and to celebrate the launch of the Obama Administration's America's Great Outdoors initiative, Secretary of the Interior Ken Salazar today announced a schedule of free admission days to many of the lands managed by Interior.
All national parks, national wildlife refuges, and many areas managed by the Bureau of Land Management will offer free admission on June 5-6, August 14-15, September 25 (Public Lands Day), and November 11 (Veterans Day). These dates are in addition to the previously announced free admission at all 392 national parks April 17-25 as part of the celebration of National Park Week.
“President Obama has made connecting Americans to the outdoors and our history a fundamental goal of the conservation initiative announced at Friday's White House Conference on America's Great Outdoors,” said Salazar. “The Interior Department was proud to host that conference and will be even prouder to host Americans who want to get outdoors to visit their public lands.”
America's public lands offer opportunities to engage in healthy, outdoor activities, whether for a few hours or a few days. More details about fee free days and activities are available for:
“What better way to celebrate this Earth Day than to make it easier for all Americans to experience the breathtaking landscapes, amazing creatures, and the stories that make up our shared heritage,” added Salazar. “By getting outdoors, we remind ourselves of our blessings and of the responsibility we all have to pass these lands on to our children and our grandchildren.”