Portal:Earth sciences/DYK/19

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 * ... that when a massive rockfall in 1920 covered part of the Brenva Glacier (pictured), it caused it to lengthen considerably, at a time when nearby glaciers were retreating?
 * ... that Desmarestia tropica, or tropical acidweed, is possibly extinct because of the 1982–83 El Niño event?
 * ... that the Lilac Fire in Southern California grew from a small brush fire to 4100 acres in one day?
 * ... that the Los Frailes ignimbrite plateau has a volume of about 2000 km3, and volcanism may have continued into the Holocene?
 * ... that several astronomical observatories are constructed on the Purico volcanic complex?
 * ... that a large lake formerly covered California's Death Valley, and occasionally reappears?