Element mix

Water + wind = whirlpool (can only have this power with water)

Water + fire = obsidian (can only have this power with rock)

Water + water = water (>_>)

Water + rock = sharp rock (can turn rock into weapons without learning fire, can only use with rock)

Wind + rock = sand (can use with wind or rock as main power)

Wind + water = whirlpool (or tornado, can only use with water as main)

Wind + fire = blowtorch (have to have fire as main) (basically it just fires a long column of fire up from the ground)

So one so forth @ramoxfire1 you like