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I'm just a beginner. I think all of them meaning the same, rock. Can anyone explain it for me?
Another important difference is that, as a Sino-Japanese word, 岩石 sounds technical, and used as an academic term for rock in general. In everyday conversations, 石 and 岩 are commonly used.
According to Japanese dictionary, although it is written about various things in detail, I have an image like an attached file.
In short, "石" is small, 岩 and 岩石 are big.
Hope it helps.