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Likewise, a whole cluster of hydrothermal features
may be connected with another cluster. If the first group is active,
the other may be less so. This shifting in the heat and water flow
is called "exchange of function." The causes of exchange
of function are not fully known. Perhaps steam bubbles build up
somewhere in the channel, creating a valve. Another theory is that
one plumbing system may somehow siphon off water from another system.
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