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The second most important constituent of the biosphere is #5mnSky+s
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liquid water. This can only exist in a very narrow range of temperatures, 'kk
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since water freezes at 0°C and boils at 100°C. This is uU#e54^
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only a tiny range compared with the low temperatures of some ,[)f-FmcU
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other planets and the hot interior of the earth, let the temperature __1__ 99&PY[f:{
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of the sun. by controlpanel Wup%.yT~Ds
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As we know, life would only be possible on the face of a __2__ :
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planet had temperatures somewhere within this range. __3__ {^SHIL
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The earth’s supply of water probably remains quite fairly constant __4__ %XK<[BF
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in quantity. A certain number of hydrogen atoms, which 0vi\o`**Mj
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are one of the main constituents of water, are lost by escaping xgv&M:%D-
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from the atmosphere to out space, but they are probably just __5__ lv0}d
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about to be replaced by new water rising away from the depths of the __6__ I CB'?yZ,
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earth during volcanic action. The total quantity of water is not PvB-Cqc
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known, and it is about enough to cover the surface of the globe __7__ I85bzzZB
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to a depth of about two and three-quarter kms. Most of it—97% pG9qD2C f
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is in the form of the salt waters of the oceans. The rest is @$%[D`Wa<
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fresh, but three quarter of this is in the form of ice at the Poles __8__ $Hbd:1%i
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and on mountains, and cannot be used by living systems when __9__ $7JWA9#N!
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melted. Of the remaining fraction, which is somewhat fewer __10__ 5fVm392+
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than 1%of the whole, there is 10-20 times as much stored as underground 3D/<R|p
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water as is actually on the surface. There is also a minor,
