PLUS Loan Interest Rates. Interest rates on Parent PLUS and Grad PLUS Loans are the same. Students attending graduate school and professional school were first able to borrow the Grad PLUS Loan in the 2006-2007 academic year.
Neptulon is the strongest Elemental Lord, Al Akir is the weakest. Ragnaros was never killed just banished back to his realm, the Fire lands, any multidimensional being is generally beyond the ability of mortals (us the players) to truly kill a permanent kill.
Although they are imprisoned in the Elemental Plane, they can be summoned to Azeroth by those who seek to use their power. The most powerful ones reign over all others, and are called the Elemental Lords. An elemental's core retains some semi-sentient properties after death.