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The second most important constituent of the biosphere is t~L4wr{B
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liquid water. This can only exist in a very narrow range of temperatures, <{W{
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since water freezes at 0°C and boils at 100°C. This is p<r^{y
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only a tiny range compared with the low temperatures of some I7_lKr3
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other planets and the hot interior of the earth, let the temperature __1__ -Mr_Ao`E
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of the sun. by controlpanel N5K(yY_T
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As we know, life would only be possible on the face of a __2__ +=/j
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planet had temperatures somewhere within this range. __3__ pT=^ o
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The earth’s supply of water probably remains quite fairly constant __4__ M_!]9#:K7
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in quantity. A certain number of hydrogen atoms, which 29grb P
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are one of the main constituents of water, are lost by escaping ;#zteqn
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from the atmosphere to out space, but they are probably just __5__ hYyIC:PXR
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about to be replaced by new water rising away from the depths of the __6__ /
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earth during volcanic action. The total quantity of water is not P8=|#yCi
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known, and it is about enough to cover the surface of the globe __7__ (su7*$wV
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to a depth of about two and three-quarter kms. Most of it—97% Ngx2N<$<*g
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is in the form of the salt waters of the oceans. The rest is [ BdRx`
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fresh, but three quarter of this is in the form of ice at the Poles __8__ bX[ZVE(L
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and on mountains, and cannot be used by living systems when __9__ m~;.kc
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melted. Of the remaining fraction, which is somewhat fewer __10__ [pms>TQ2
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than 1%of the whole, there is 10-20 times as much stored as underground bkR~>F]FAu
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water as is actually on the surface. There is also a minor,
