The first student you are likely to find says he has lost an Animal Skull, pickpocket the Digsite Worker indicated on the map and you will eventually get the skull, return to the student and he will give you the answer to the first question: Earth Science is the study of earth, contents and it's history.
no
the goblins on the first floor drop it.
you can teleport to barbarian villiage.
The Left Skull Half is dropped by Ankous on the fourth level of the Stronghold of Security.
Draynor Village, Wizard's Tower.
dropped by ankous in the security of stronghold
OICU812
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Use them on eachother, as part of a sceptre.
ankous or minotaurs i guess
minotours for right skull half,
just get the quest for it but get help if to hard