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.
The dragonfly s agile flight and its ability to move in all six directions exude a sense of power and poise-something that comes only with age and maturity. The dragonfly can move at an amazing 45 miles an hour, hover like a helicopter fly backwards like a hummingbird, fly straight up, down and on either side.