A pair of organisms which would represent a predator-prey relationship could be for example wolves and deer. The wolf in this case is of course the predator while the deer plays the role of prey. Wolves hunt deer and the latter then have to try and run away from being eaten by wolves.
Thunder is caused by the extremely rapid expansion of air around a bolt of lightning due to the very high temperature. It is also caused by the change of pressure around a lightning bolt. Hope that helped you.
