Why is a ‘popping line’ called so?

Why is a ‘popping line’ called so?

The popping crease is a line which is 4 feet in front of the stumps and marks the limit of the batsman’s ground. At the early stages of playing cricket, a hole was cut in the ground large enough to contain the ball and butt-end of the bat. When taking a run, the batsman was required to put his bat into the hole. To run a batsman out, the wicket keeper used to put the ball into the hole. This practice of popping the bat in the hole in order to completed a run led to many injuries. The popping crease got its name from this popping hole.