water 英语作文帮 忙 一 下 写 个 关 于 water 的 作 文谢 了

Water is a common chemical substance that is essential for the survival of all known forms of life。In typical usage,water refers only to its liquid form or state,but the substance also has a solid state,ice,and a gaseous state,water vapor or steam。About 1。460 petatonnes (Pt) (1021kilograms) of water covers 71% of the Earth's surface,mostly in oceans and other large water bodies,with 1。6% of water below ground in aquifers and 0。001% in the air as vapor,clouds (formed of solid and liquid water particles suspended in air),and precipitation。[1] Saltwater oceans hold 97% of surface water,glaciers and polar ice caps 2。4%,and other land surface water such as rivers,lakes and ponds 0。6%。Some of the Earth's water is contained within water towers,biological bodies,manufactured products,and food stores。Other water is trapped in ice caps,glaciers,aquifers,or in lakes,sometimes providing fresh water for life on land。