Fire vs water. Which side will prevail? Water usually but fire can win too. The card's info says:
RB10-EN056:
Battle of the Elements
Normal Trap
During the Damage Step of two battling monsters: Apply this effect based on the battling monsters' Attributes.
- FIRE and WATER: Destroy the FIRE monster.
- DARK and LIGHT: Return the DARK monster to the hand.
- WIND and EARTH: The EARTH monster loses 1000 ATK.
Common