Early in its history, Earth was molten and had neither atmosphere nor oceans. However, as the gradually cooling surface began to solidify into rock, intense heat trapped below Earth's outer crust had to get out somehow. The result was surely volcanoes, geysers, earthquakes, and a variety of ...
选项C:firn做关键词定位至本段倒数第三句，根据原文第一段得知，formation of firn是冰川形成的一个步骤，既然Surplus snowfall有助于冰川的发展，那对选项中提到的firn的形成也有帮助；
Glaciers are part of Earth’s hydrologic cycle and are second only to the oceans in the total amount of water contained. About 2 percent of Earth’s water is currently frozen as ice. Two percent may be adeceivingfigure, however, since over 80 percent of the world’s freshwater is locked...
Glaciers are part of Earth’s hydrologic cycle and are second only to the oceans in the total amount of water contained. About 2 percent of Earth’s water is currently frozen as ice. Two percent may be a deceiving figure, however, since over 80 percent of the world’s freshwater is ...
Glaciers are part of Earth’s hydrologic cycle and are second only to the oceans in the total amount of water contained. About 2 percent of Earth’s water is currently frozen as ice. Two percent may be a deceiving figure, however, since over 80 percent of the world’s freshwater is lock...
When snowfalls on high mountains or in polar regions, it may become part of the glacial system. Unlike rain, which returns rapidly to the sea or atmosphere, the snow that becomes part of a glacier is involved in a much more slowly cycling system. Here water may be stored in ice form ...
.About2percentofEarth’swateris currentlyfrozenasice.Twopercentmaybeadeceivingfigure,however,since over80percentoftheworld’sfreshwaterislockedupasiceinglaciers,withthe majorityofitinAntarctica.Thetotalamountoficeisevenmoreawesomeifwe estimatethewaterreleaseduponthehypotheticalmeltingoftheworld’sglaciers. Sealevel...
The total amount of ice is even more awesome if we estimate the water released upon the hypothetical melting of the world
Glaciers are part of Earth’s hydrologic cycle and are second only to the oceans in the total amount of water contained. About 2 percent of Earth’s water is currently frozen as ice. Two percent may be adeceivingfigure, however, since over 80 percent of the world’s freshwater is locked...
Glaciers are part of Earth’s hydrologic cycle and are second only to the oceans in the total amount of water contained. About 2 percent of Earth’s water is currently frozen as ice. Two percent may be a deceiving figure, however, since over 80 percent of the world’s freshwater is lock...