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The second most important constituent of the biosphere is KI E k/]<H
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liquid water. This can only exist in a very narrow range of temperatures, H|PrsGW
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since water freezes at 0°C and boils at 100°C. This is vP3K7En
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only a tiny range compared with the low temperatures of some xK$} QZ)
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other planets and the hot interior of the earth, let the temperature __1__ > ?S\ ~Y
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of the sun. by controlpanel &g*klt'B
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As we know, life would only be possible on the face of a __2__ J1.qhy>
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planet had temperatures somewhere within this range. __3__ n4 ^*h4J7
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The earth’s supply of water probably remains quite fairly constant __4__ Xa4GqV9M/-
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in quantity. A certain number of hydrogen atoms, which ^rL ,&rk
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are one of the main constituents of water, are lost by escaping u0xQ;BQ
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from the atmosphere to out space, but they are probably just __5__ ])C>\@c6Gm
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about to be replaced by new water rising away from the depths of the __6__ 5)mVy?Z
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earth during volcanic action. The total quantity of water is not VO9X kA7
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known, and it is about enough to cover the surface of the globe __7__ G[#.mD{k
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to a depth of about two and three-quarter kms. Most of it—97% uMHRUi
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is in the form of the salt waters of the oceans. The rest is ~ ^x-ym5
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fresh, but three quarter of this is in the form of ice at the Poles __8__ [g +y_@9s
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and on mountains, and cannot be used by living systems when __9__ v`SY6;<2
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melted. Of the remaining fraction, which is somewhat fewer __10__ rCE;'? Y
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than 1%of the whole, there is 10-20 times as much stored as underground ~5ubh 2{
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water as is actually on the surface. There is also a minor,
