Thank you very much! I have other animals that can use oak, like my tarantulas, but thanks for the info!Oohh oohh oohhh I'm an arborist!!!! It's my time to shine!!
Yes it's an oak, but it could be any number of species in the white oak group. All oaks are in the genus Quercus, and there are two major groups, the white oak group and the red oak group. White oaks have rounded lobes around the leaf edge, red oaks have pointed lobes (but are still rounded between the lobes).
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photo from: Red Oak vs White Oak
In all my aquarium reading, I've only ever seen red oaks (and their kin such as pin, black, scarlett, etc) recommended for use in aquariums. Not to say whites might not work, but I've only seen reds recommended.
Also, on a site like your school, unless you know the lawn is maintained organically, I'd avoid using leaves which may have residues from lawn chems or ferts in them.