Most often when we think about exercise we think aerobic. That is in part because of the high energy classes available at most gyms. Aerobic exercise is not confined to those classes, however. For most people, low to moderate exercise or exertion is generally aerobic.
The biggest iron mine. The worlds biggest open pit iron mine can be found near Hibbing, Minnesota. At its maximum, the area covered by the Hull Rust open pit mine is five miles (8km) long, 2 miles (3,2km) wide and 535 feet (180m) deep. It looks like a man-made Grand Canyon of over 2,000 acres (8,1kmÂ²).
Sishen Mine, Northern Cape, South Africa. Sishen mine is located 30km away from the town of Kathu in the Northern Cape Province of South Africa. It is one of the largest open pit mines producing iron ore in the world. Mining at Sishen is carried out as part of Anglo American's Kumba Iron ore operation. The mine accounts for the majority of Kumba's iron ore production.