It goes a little something like this:

Fire: Wrath, Searing, Searing, Frost Resist
Earth: Earthbind, Tremor, Tremor, Tremor (dropped 1 at a time, 1 second apart)
Water: Fire Resist, Cleansing, Cleansing, Mana Stream
Air: Grounding, Grounding, Grounding, Grounding

I use that for all arenas and pvp.

Still need to test if cleansing can stack if staggered, might macro that with my tremor macro.