中国最大的教育门户E度高考网www
gaokao
com说明文类(I)★WatergoesaroundandaroundEarthinaneverendingjourneycalledthewatercycle(循环)
Thesunheatsuplakes,oceans,andotherwetplacesonEarth
Whenthewatergetswarmenough,itchangesintovapour
Plantsalsogiveofflotsofwatervapour
Someofthiswatervapourcoolsoffhighintheskyandbecomesclouds
ThenitfallsbacktoEarthinanewplaceasrainorsnow
Thiscyclehappensoverandoveragain
Thegroundcanabsorbwaterlikeasponge(海绵)
Ifyoucouldseethisgroundwater,itwouldn’tlooklikealakeorriver
Thegroundwaterismixedinwiththerocksandsandthatlieinlayers(层)belowEarth’ssurface
Groundwatermovesalongslowly
Howslowly
Maybe1
5kilometresinonecentury
Someofthiswaterhasbeenundergroundforthousandsofyears
Andoncegroundwaterispumpedoutofthegroundfromadeepwell(井)bypeople,itmaytakehundredsofyearsforanotherwatertotakeitsplace