For awhile I wanted to be a geology major.  It's pretty interesting stuff.  Unfortunatly unless you want to work for the oil companies, it's not really that useful.  So, being the undecisive self, I never got around to making it my major, and then I dropped out of school.  Here are some pretty interesting aspects of geology.
Sedimentary Rocks
Volcanoes
Age Determination
Alternative Energy Sources
Rock Time
Rock Cycle
Plate Tectonics
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