A remarkable inlet is naturally carved naturally into the rocks at the seashore of Maine. As waves roll in, air and water is force through a small cavern and, with a loud clap like thunder, can shoot 40 feet into the air.
Cut from the Earth over time by the Colorado River, the Grand Canyon averages 4,000 feet deep for its entire 277 miles. It is 6,000 feet deep at its deepest point and 15 miles at its widest. Oddly, geologists aren't sure how old it is. Separate studies in 2008 put its age at either 6 million years or 16 million years.
Wizard Island pokes up in the middle of Crater Lake in Oregon. The lake, 1,943 feet deep, is the deepest in the United States. It was not made by a crater, however. Rather, it's a volcanic caldera — a giant basin made by the collapse of a volcano that erupted about 7,700 years ago. The region around the lake gets an average of 533 inches of snow per year — more than 44 feet. Credit: NPS
On the border of Canada and the U.S. (New York), Niagara Falls formed when the last Ice Age receded. About 4 million cubic feet of water cascade down the 167-foot (52m) drop every minute.
The Johns Hopkins Glacier, like a giant river of ice, meets the sea at Glacier Bay, a vast region where multiple glaciers meet, melt, and in some cases recede. In 1794, Captain George Vancouver and crew described the bay as just a small five-mile indent in a gigantic glacier that stretched off to the horizon. That massive glacier was more than 4,000 feet thick in places, up to 20 miles wide, and extended more than 100 miles to the St. Elias mountain range. By 1879, however, naturalist John Muir discovered that the ice had retreated more than 30 miles, forming an actual bay. By 1916, the Grand Pacific Glacier — the main glacier credited with carving the bay — had melted back 60 miles to the head of what is now Tarr Inlet.
On the border of Canada and the U.S. (New York), Niagara Falls formed when the last Ice Age receded. About 4 million cubic feet of water cascade down the 167-foot (52m) drop every minute.The Johns Hopkins Glacier, like a giant river of ice, meets the sea at Glacier Bay, a vast region where multiple glaciers meet, melt, and in some cases recede. In 1794, Captain George Vancouver and crew described the bay as just a small five-mile indent in a gigantic glacier that stretched off to the horizon. That massive glacier was more than 4,000 feet thick in places, up to 20 miles wide, and extended more than 100 miles to the St. Elias mountain range. By 1879, however, naturalist John Muir discovered that the ice had retreated more than 30 miles, forming an actual bay. By 1916, the Grand Pacific Glacier — the main glacier credited with carving the bay — had melted back 60 miles to the head of what is now Tarr Inlet.
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