Chinese surnames are used by Han Chinese and Sinicized ethnic groups in Mainland China, Hong Kong, Macau, Malaysia, Taiwan, Korea, Singapore, Vietnam and among overseas Chinese communities. In ancient times two types of surnames existed, namely xing (Chinese: å§; pinyin: xÃ¬ng) or lineage names, and shi (Chinese: æ°; pinyin: shÃ¬) or clan names.
An ice sheet is a large permanent layer of ice covering a continental shelf, defined as having an extent greater than 50,000 km2 (19,305 mi2). An ice sheet is larger than a glacier or ice shelf.
Continental glaciers (ice sheets, ice caps) are massive sheets of glacial ice that cover landmasses. Continental glaciers are currently eroding deeply into the bedrock of Antarctica and Greenland. The vast ice sheets are incredibly thick and have thus depressed the surface of the land below sea level in many locations.