Aa

Science / Geology / Aa: A blocky and fragmented form of lava occurring in flows with fissured and angular surfaces.
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Maar Volcano

Science / Geology / Maar Volcano: A volcanic crater without a cone, believed to have been formed by an explosive eruption of trapped gases. MORE

Kwanzaa

Life Style / Holiday / Kwanzaa: A professor, Dr. Maulana Ron Karenga, wanted to encourage African Americans to celebrate their heritage so he started Kwanzaa in California in 1966. Traditionally beginning December 26, families excha MORE

National Ambient Air Quality Standards (NAAQS)

Business / Agriculture / National Ambient Air Quality Standards (NAAQS): National standards set by the Environmental Protection Agency under authority of the Clean Air Act: NAAQS define the maximum allowable concentrations of specified air pollutants in outdoor (ambient) a MORE

National Collegiate Athletic Association (NCAA)

Entertainment / Football / National Collegiate Athletic Association (NCAA): Principal governing body of college sports, including college football MORE

National Oceanic And Atmospheric Administration (NOAA)

Science / Weather / National Oceanic And Atmospheric Administration (NOAA): A branch of the U.S. Department of Commerce, it is the parent organization of the National Weather Service. It promotes global environmental stewardship, emphasizing atmospheric and marine resources. MORE

Kao (Kaau)

Health / Tai Chi / Kao (Kaau): Literally: 'leaning.' This is the shifting of the body into the partner to unbalance them. There does not seem to be a good English equivalent: 'bumping' suggests crashing force. Kao does not rely on MORE