Q. What are nimbus clouds?
A. Nimbus is the Latin word for “clouds which bring a storm;” and all clouds from which rain falls are so named.
Q. What appearance takes place in the clouds at the approach of rain?
A. The cum’ulus cloud becomes stationary, and cirrus streaks settle upon it, forming cumulo-stratus clouds; which are black at first, but afterwards of a grey colour.
Q. Why do clouds gather round mountain-tops?
A. Because (as they float along) they dash against the mountains; and (being arrested in their motion) collect round the top.
Q. What is the use of clouds?
A. 1st—They act as screens to arrest the radiation of heat from the earth:
2ndly—They temper the heat of the sun’s rays: and