I think most students are familiar with using Google to search for things, so the interface is not a big stretch, as opposed to using other science specific databases available through the library. It does come down to what the objectives for the students are though, if you want them to find a few primary lit articles to include in a research project then Google Scholar would probably be just fine, but if you're objective is to get them ready for more grad level research then you probably want them to have to learn how to use some other databases ...
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