", are both okay from a purely grammatical point of view, and mean approximately the same thing. However, the first sentence is very awkward, in my opinion. " - rocks do not do things, they are inanimate.
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cho7712And I'm wondering if the example sentence is all-right from the point of 'meaning'.Yes. It's all right grammatically. You are right to mention that 'did' seems to beg for an agentive subject, but I think we overlook this in ordinary conversation - and in examples in grammar books when the author is trying to illustrate some point.