Q. What is the second chief source of heat?
A. Electricity.
Q. What is lightning?
A. Lightning is only an Electric Spark, taken from the clouds.
Q. What causes the discharge of an electric cloud?
A. When a cloud, overcharged with electric fluid, approaches another which is under-charged, the fluid rushes from the former into the latter, till both have the same quantity.
Q. Is there any other cause of lightning, besides the one just mentioned?
A. Yes; sometimes mountains, trees, and steeples, will discharge a lightning cloud floating near; and sometimes electric fluid rushes out of the earth, into the clouds.
Q. What produces electricity in the clouds?