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The second most important constituent of the biosphere is 0Q81$% @<
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liquid water. This can only exist in a very narrow range of temperatures, G :W4<w
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since water freezes at 0°C and boils at 100°C. This is v" y0D
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only a tiny range compared with the low temperatures of some 'y(;: Kc
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other planets and the hot interior of the earth, let the temperature __1__ i+x$Y)=
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of the sun. by controlpanel 83
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As we know, life would only be possible on the face of a __2__ NQ7 j{dJ?
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planet had temperatures somewhere within this range. __3__ 2~:jg1
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The earth’s supply of water probably remains quite fairly constant __4__ X6+2~'*t
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in quantity. A certain number of hydrogen atoms, which 9ghZL Q
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are one of the main constituents of water, are lost by escaping >d .o1<
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from the atmosphere to out space, but they are probably just __5__ l[KFK%?
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about to be replaced by new water rising away from the depths of the __6__ 0((3q'[ <
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earth during volcanic action. The total quantity of water is not 1J}i :i&
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known, and it is about enough to cover the surface of the globe __7__ 5F@7A2ZR
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to a depth of about two and three-quarter kms. Most of it—97% w]Q0}Z
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is in the form of the salt waters of the oceans. The rest is 5O.dRp7d J
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fresh, but three quarter of this is in the form of ice at the Poles __8__ yN* H IN
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and on mountains, and cannot be used by living systems when __9__ d/Q}I[J.u
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melted. Of the remaining fraction, which is somewhat fewer __10__ goYRA_%cX
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than 1%of the whole, there is 10-20 times as much stored as underground zY f `o0U
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water as is actually on the surface. There is also a minor,
