What should be used by Avatar to cross this pool of mud?
What should be used to cross this pool of mud?
What should the Avatar choose to cross the field without polluting the air?
What should be selected to cross this river?
Pick up items that would help the avatar to clear this level.
A tennis ball is partly submerged in the mud water in a pool. The upward force acted by the displaced mud water on the ball is called ___ .