Which is an example of an explosion? a. soccer player kicking a ball into the goal. b. a cannon firing. c. two cars collide and move off together. d. a bowling ball hitting the pins.

B.) a cannon firing off.

This is the only logical option that involves somewhat of a explosion.

B. A cannon firing,

Is the only correct and logical answer, because we all know th other options couldn't cause an explosion...

LOL also glad i could help!

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

frequency or wavelenth of em radiation in a vacuum