This sentence is certainly not correct per se. It does not so much matter that the relative pronoun ‘Which’ fails the touch rule. There are four nouns preceding '
which’, namely World, Formations, Iridium, high levels.
One of them must suggest the cataclysmic impact of a meteor millions of years ago
Either world or formations or iridium can not be the logical referent, since none of them as such can indicate a catastrophic effect. It must then be the plural ‘
high levels’ that must be the intended antecedent and thus requires the plural ‘
suggest’ rather than the singular
‘suggests’P.S: May I know why this is classified under absolute phrases?
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