Chimborazo is a dormant volcano that last erupted about 1,400 years ago, around 640 AD. At least seven eruptions have occurred over the last 8,000 years. The volcano had a major collapse about 35,000 years ago, with major debris avalanches sweeping down the mountain and damming the Rio Chambo and forming a temporary lake.
Though the summit of Mt. Everest is the highest point on the Earth above sea level, the summit of Chimborazo is the farthest place on the surface of the Earth from its exact center, a distance of 3,968 miles (6,384.4 kilometers). Chimborazo’s summit is 2.1 kilometers farther from the Earth’s center than Everest.
Chimborazo’s upper elevations are covered with glaciers which have slowly decreased in size over the last fifty years due to global warming and falling ash from the active volcano Tungurahua, which falls on the glaciers, warms in sunlight, and melts the snow. The glaciers, providing water for Ecuadorians, are also mined for ice which is later sold in markets.