珍惜水的作文
<p>同学们，你们珍惜水吗？水可是非常宝贵的。如果你不信，那就看一看水在地球上的分布情况吧！</p><p><span word="Students">Students</span>, <span word="do">do</span> <span word="you">you</span> <span word="cherish">cherish</span> <span word="water">water</span>? <span word="Water">Water</span> <span word="is">is</span> <span word="very">very</span> <span word="precious">precious</span>. <span word="If">If</span> <span word="you">you</span> <span word="don">don</span>'<span word="t">t</span> <span word="believe">believe</span> <span word="it">it</span>, <span word="take">take</span> <span word="a">a</span> <span word="look">look</span> <span word="at">at</span> <span word="the">the</span> <span word="distribution">distribution</span> <span word="of">of</span> <span word="water">water</span> <span word="on">on</span> <span word="the">the</span> <span word="earth">earth</span>!</p><p>同学们，你们知道吗？地球上水的总量约有13600000000立方公里，接近14亿立方公里，如果全部铺在地球表面，水层厚度可达到3000米，海洋中聚集着绝大部分水，占地球总水量的97.2%，它覆盖着地球表面的70%以上，陆地上的河湖沿的总水量的23万立方公里，其中淡水约占一半，只占地球总水量的万分之一（2.350%）。</p><p><span word="Students">Students</span>, <span word="do">do</span> <span word="you">you</span> <span word="know">know</span>? <span word="The">The</span> <span word="total">total</span> <span word="amount">amount</span> <span word="of">of</span> <span word="water">water</span> <span word="on">on</span> <span word="the">the</span> <span word="earth">earth</span> <span word="is">is</span> <span word="about">about</span> 13600000000 <span word="cubic">cubic</span> <span word="kilometers">kilometers</span>, <span word="which">which</span> <span word="is">is</span> <span word="close">close</span> <span word="to">to</span> 1.4 <span word="billion">billion</span> <span word="cubic">cubic</span> <span word="kilometers">kilometers</span>. <span word="If">If</span> <span word="all">all</span> <span word="the">the</span> <span word="water">water</span> <span word="is">is</span> <span word="laid">laid</span> <span word="on">on</span> <span word="the">the</span> <span word="earth">earth</span>'<span word="s">s</span> <span word="surface">surface</span>, <span word="the">the</span> <span word="thickness">thickness</span> <span word="of">of</span> <span word="the">the</span> <span word="water">water</span> <span word="layer">layer</span> <span word="can">can</span> <span word="reach">reach</span> 3000 <span word="meters">meters</span>. <span word="Most">Most</span> <span word="of">of</span> <span word="the">the</span> <span word="water">water</span> <span word="in">in</span> <span word="the">the</span> <span word="ocean">ocean</span>, <span word="accounting">accounting</span> <span word="for">for</span> 97.2% <span word="of">of</span> <span word="the">the</span> <span word="total">total</span> <span word="water">water</span> <span word="on">on</span> <span word="the">the</span> <span word="earth">earth</span>, <span word="covers">covers</span> <span word="more">more</span> <span word="than">than</span> 70% <span word="of">of</span> <span word="the">the</span> <span word="earth">earth</span>'<span word="s">s</span> <span word="surface">surface</span>. <span word="The">The</span> <span word="total">total</span> <span word="water">water</span> <span word="along">along</span> <span word="the">the</span> <span word="rivers">rivers</span> <span word="and">and</span> <span word="lakes">lakes</span> <span word="on">on</span> <span word="the">the</span> <span word="land">land</span> <span word="is">is</span> 230000 <span word="cubic">cubic</span> <span word="kilometers">kilometers</span>, <span word="of">of</span> <span word="which">which</span> <span word="the">the</span> <span word="fresh">fresh</span> <span word="water">water</span> <span word="accounts">accounts</span> <span word="for">for</span> <span word="about">about</span> <span word="half">half</span>, <span word="only">only</span> <span word="accounting">accounting</span> <span word="for">for</span> <span word="the">the</span> <span word="total">total</span> <span word="water">water</span> <span word="on">on</span> <span word="the">the</span> <span word="earth">earth</span> <span word="One">One</span> <span word="thousandth">thousandth</span> <span word="of">of</span> <span word="the">the</span> <span word="quantity">quantity</span> (2.350%).</p><p>目前人类直接利用的是地下淡水湖泊淡水和河床水，占地球总水量的0.77%实际能利用的水只有0.2%。</p><p><span word="At">At</span> <span word="present">present</span>, <span word="human">human</span> <span word="beings">beings</span> <span word="directly">directly</span> <span word="use">use</span> <span word="the">the</span> <span word="fresh">fresh</span> <span word="water">water</span> <span word="of">of</span> <span word="underground">underground</span> <span word="freshwater">freshwater</span> <span word="lakes">lakes</span> <span word="and">and</span> <span word="river">river</span> <span word="beds">beds</span>, <span word="accounting">accounting</span> <span word="for">for</span> 0.77% <span word="of">of</span> <span word="the">the</span> <span word="total">total</span> <span word="water">water</span> <span word="volume">volume</span> <span word="of">of</span> <span word="the">the</span> <span word="earth">earth</span>, <span word="and">and</span> <span word="only">only</span> 0.2% <span word="of">of</span> <span word="the">the</span> <span word="water">water</span> <span word="actually">actually</span> <span word="can">can</span> <span word="be">be</span> <span word="used">used</span>.</p>
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