The highest historically active volcano in the world
The two peaks of the mountain are estimated to be about 6,892 m (22,612 ft). The mountain also carries a small (100m diameter) freshwater lake which although small is viewed as the highest in the world. The vulture (Gyps africanus) is critically endangered but is an African native.
Ash from what volcano, when it erupted in June 2011, grounded flights in Chile, Bolivia, Argentina, Uruguay and Paraguay and disrupted air traffic over Australia and New Zealand?
What is the dam in the Black Canyon of the Colorado River on the border between the US states of Arizona and Nevada that was completed in 1935?