Cryosphere glossary
a period of cooling that started around the early 14th century, peaked in the 17th century, and ended in the mid-19th century, and was marked by expanding glaciers in Europe, North America, and Asia
an ice-wedge polygon in which thawing of ice-rich permafrost has left the central area in a relatively depressed position.
clouds in the lower region of the atmosphere, from ground level to 6500 feet (2000 meters); includes stratus, stratocumulus, the bases of cumulus and cumulonimbus, and sometimes nimbostratus clouds.
white or sometimes reddish vertical streaks of light extending from above and below the sun; they are caused by light reflected off the mirror-like surfaces of ice; most commonly seen at sunrise and sunset.