so expresses a mirrored relationship that otherwise might be merely comparative. 'As interest rates rise, so does my blood-pressure'-- gives even an impression of cause-and-effect. 'Interest rates rise; so do the flood waters,'-- no cause-and-effect relationship here, nor any other connection than the mere comparison of rising .
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MurofRight. Except you want to ask. '...those two things do not necessarily have a cause and effect relationship, right?'.
The only difference is that those two things are not necessarily have cause and effect relationship as the "as... so ..." one, right?