This website is the digital version of the 2014 National Climate Assessment, produced in collaboration with the U.S. Global Change Research Program. For the official version, please refer to the PDF in the downloads section.
Lahars move rapidly down valleys like rivers of concrete. If you are on the floor of a valley that leads from a volcano and become aware of an oncoming lahar, seek high ground. Lahar is an Indonesian term that describes a hot or cold mixture of water and rock fragments that flows down the slopes of a volcano and typically enters a river valley.
How fast can hippos run? Quick Answer. On land, hippos can run at speeds of 18-31 miles per hour, though they can only sustain this speed over short distances; in water, hippos can move at about 5 miles per hour. Hippos can easily outrun and are known to be quite aggressive toward humans.