Mount Mazama is a stratovolcano in the Oregon segment of the Cascade Volcanic Arc and the Cascade Range located in the United States. The volcano’s collapsed caldera holds Crater Lake, and the entire mountain is located within Crater Lake National Park. When it last erupted, the eruption was 42 times greater than the eruption of Mount St. Helens in 1980.Mazama’s summit was destroyed by a volcanic eruption that occurred around 5677 (± 150) BC. The eruption reduced Mazama’s approximate 3,700 m height by about 1,600 m. Much of the volcano fell into the volcano’s partially emptied neck and magma chamber. At 2,487 m, Hillman Peak is now the highest point on the rim.
Mount Katmai is a large stratovolcano on the Alaska Peninsula in southern Alaska, located within Katmai National Park and Preserve. It is about 10 km in diameter with a central lake-filled caldera about 4.5 by 3 km in area, formed during the Novarupta eruption of 1912. The caldera rim reaches a maximum elevation of 2,047 m. In 1975 the surface of the crater lake was at an elevation of about 1,286 m, and the estimated elevation of the caldera floor is about 1,040 m. The mountain is located in Kodiak Island Borough, very close to its border with Lake and Peninsula Borough.
Millennium Park is a public park located in the Loop community area of Chicago in Illinois, US, and originally intended to celebrate the millennium. It is a prominent civic center near the city’s Lake Michigan shoreline that covers a (99,000 m2 section of northwestern Grant Park. The area was previously occupied by parkland, Illinois Central rail yards, and parking lots.The park, which is bounded by Michigan Avenue, Randolph Street, Columbus Drive and East Monroe Drive, features a variety of public art. As of 2009, Millennium Park trailed only Navy Pier as a Chicago tourist attraction.
Photo by IceNineJon.
The Washington Monument is an obelisk on the National Mall in Washington, D.C., built to commemorate George Washington, once commander-in-chief of the early Continental Army and the first American president. Standing due east of the Reflecting Pool and the Lincoln Memorial, the monument, made of marble, granite, and bluestone gneiss,is both the world’s tallest stone structure and the world’s tallest obelisk, standing 554 feet 7 11⁄32 inches tall; although taller monumental columns exist, they are neither all stone nor true obelisks.
Photo by Romvi.
The Grand Canyon is a steep-sided canyon carved by the Colorado River in the United States in the state of Arizona. It is contained within and managed by Grand Canyon National Park, the Hualapai Tribal Nation, and the Havasupai Tribe.The Grand Canyon is 446 km long, up to 29 km wide and attains a depth of over a mile .Nearly two billion years of Earth’s geological history have been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted. While the specific geologic processes and timing that formed the Grand Canyon are the subject of debate by geologists,recent evidence suggests that the Colorado River established its course through the canyon at least 17 million years ago.Since that time, the Colorado River continued to erode and form the canyon to its present-day configuration.