I would definitely exclude maritime science and environmental science: both are more focused on the life and interaction of various parts of ocean, and less on the form of the rocks.
It is in fact a sub-discipline of both geology and eceanography: it's a part of geology by the virtue of focusing on rocks, and it's part of oceanography by the virtue of focusing on the rocks on the ground of the oceans
Performance-in-public syndrome is the right answer because John is having issues playing when he is in pubic but not when he is alone, therefore playing in front of other people is causing John the anxiety.
