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The second most important constituent of the biosphere is FGc#_4SiL
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liquid water. This can only exist in a very narrow range of temperatures, kt_O=
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since water freezes at 0°C and boils at 100°C. This is T\4>4eX-
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only a tiny range compared with the low temperatures of some Q
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other planets and the hot interior of the earth, let the temperature __1__ G i(
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of the sun. by controlpanel Unt]=S3u
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As we know, life would only be possible on the face of a __2__ g.;2N 9
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planet had temperatures somewhere within this range. __3__ ]JmE(Y1(1
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The earth’s supply of water probably remains quite fairly constant __4__ ;Tq4!w'rH
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in quantity. A certain number of hydrogen atoms, which 4v5qK
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are one of the main constituents of water, are lost by escaping &h6 `hP_
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from the atmosphere to out space, but they are probably just __5__ kxA T
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about to be replaced by new water rising away from the depths of the __6__ <5FGL 96
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earth during volcanic action. The total quantity of water is not Yyw3+3
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known, and it is about enough to cover the surface of the globe __7__ HG5E,^1n
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to a depth of about two and three-quarter kms. Most of it—97% 28}L. >5k
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is in the form of the salt waters of the oceans. The rest is (Nf!E[ }Z
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fresh, but three quarter of this is in the form of ice at the Poles __8__ )7E7K%:b,
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and on mountains, and cannot be used by living systems when __9__ CzDg?w b
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melted. Of the remaining fraction, which is somewhat fewer __10__ }^odUIj
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than 1%of the whole, there is 10-20 times as much stored as underground Mt~2&$>
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water as is actually on the surface. There is also a minor,
