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.
Ever wonder how our public lands system became what it is today? Check out the legacies of eight presidents who made a big difference in American conservation.
Theodore Roosevelt - It’s impossible to compile a list of presidents who impacted public lands without mentioning President Theodore Roosevelt. Often called a “force of nature” due to his energetic personality, he helped lay the foundation to protect wilderness and wildlife that shaped American land and culture. As president, Roosevelt created five national parks, 18 national monuments, 51 bird sanctuaries, began the National Wildlife Refuge system and set aside more than 100 million acres for national forests.
Abraham Lincoln - Despite being one of our greatest presidents, people don’t often think about President Abraham Lincoln when it comes to conservation. However, he changed the course of America’s public lands when he signed a law setting aside the Mariposa Grove and Yosemite Valley as protected lands in 1864. Overshadowed by the Civil War, this news received little attention, but it set a significant precedent -- places of scenic and natural importance should be protected for the enjoyment of all people.
Ulysses S. Grant - Few historians consider Ulysses S. Grant’s presidency to be innovative or forward-thinking, but he accomplished two firsts in the area of conservation that live on today. In 1868, Grant set aside the Pribilof Islands in Alaska as a reserve for the northern fur seal. This was the earliest effort to use federally owned land to protect wildlife. In 1872, he signed a law establishing Yellowstone as our nation’s first national park. Today, there are more than 400 sites in the national park system.
Woodrow Wilson - In 1916, President Woodrow Wilson signed the “Organic Act,” creating the bureau responsible for protecting America’s 35 already existing national parks and monuments and those yet to be established. Our national parks are called America's best idea, and this year, we're celebrating 100 years of the Naitonal Park Service. Wilson’s administration also presided over the creation of several new national parks, including icons like Dinosaur National Monument and Rocky Mountain National Park.
Franklin Delano Roosevelt - As a lifelong lover of nature and wildlife, President Franklin D. Roosevelt undertook many executive actions to protect and improve public lands. Not only did he create 11 national monuments, his New Deal program -- the Civilian Conservation Corps -- dramatically impacted existing park lands. Millions of people were put to work building infrastructure in national parks and forests, ultimately planting billions of trees, building roads and trails, and combating soil erosion.
Jimmy Carter - The president from Georgia had a massive impact on public lands in Alaska. When President Jimmy Carter signed the Alaska National Interest Lands Conservation Act of 1980 into law, he set aside over 104 million acres of land, creating 10 national parks and preserves, two national monuments, nine national wildlife refuges, two national conservation areas and 25 wild and scenic rivers ensuring that large portions of wilderness remain undeveloped.
Barack Obama - In the seven years since President Barack Obama took office, he’s shown his commitment to conservation and preserving America’s special places for future generations. Obama has established 22 national monuments and expanded others to set aside more than 265 million acres of land and water -- that’s more than any other president. This includes the expansion of the Pacific Remote Islands Marine National Monument into the largest marine monument in the world and most recently designating three new national monuments in the California Desert.
Thomas Jefferson - President Thomas Jefferson’s public lands legacy centers on the 1803 Louisiana Purchase. Doubling the size of the country, the United States acquired territory that formed 15 new states and included the future sites of many national parks, including Glacier National Park, Yellowstone National Park and Rocky Mountain National Park. Jefferson also sponsored the Lewis & Clark Expedition, which led to significant additions to the zoological and botanical knowledge of the continent.