point-to see the blast zone of an explosive, where the bomb is detinated and then what surrounding area is effected.

line/road-to see what areas of the forest need to be cut around the road in order to stop forest fire from jumping the road

point-where the hardest hit area of an earthquake is, the earth quake buffer itself and then a buffer on the effected area to send in medical help

line-a buffer on a proposed road to see how close moose habitat is in order to prevent animal collisions

point-using a buffer on a building site of a house to see if it will have any noise polution/crime/air quality issues(of course living in pg most area have air quality issues HA)