Yes; it does much harm by destroying trees, houses, animals, and, indeed, almost everything in its course.
What does lightning sometimes do with buildings?
It sets the buildings on fire so that they are burned.
How are buildings protected from injury by lightning?
They are protected by means of the lightning-rod, which was invented by Dr. Franklin.
Of what is the lightning-rod made?
The lightning-rod is made of some metal, usually of iron or copper, which is a good conductor of electricity.
What does the lightning-rod do when the building is struck?
The lightning-rod conducts the electricity to the earth, so that it does not injure the building.
Must the lightning-rod be higher than the building?