The Hoover Dam, built along the Colorado River between 1931 and 1936 reaches 726 feet in height (221 metres). More interesting dam facts.

The longest recorded swim was 2938 km down the Mississippi River in 1930. The swimmer spend 742 hours in the water.

Around 75% of the volcanoes on Earth are found in the Pacific Ring of Fire, an area around the Pacific Ocean where tectonic plates meet.

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