Q. How can winds change the shape of clouds by altering the position of their parts?
A. Because clouds are so voluble and light, that every breath of wind changes the position of those ves’cicles or bubbles.
Q. What are the general colours of the clouds?
A. White and grey, when the sun is above the horizon: but red, orange, and yellow, at sun-rise and sun-set.
The blue sky cannot be considered as clouds at all.
Q. Why are the last clouds of evening generally of a red tinge?
A. Because red rays are the least refrangible of all; and, therefore, are the last to disappear.
Q. What is meant by being “less refrangible”?
A. Being less able to be bent. Blue and green rays being very easily bent (by the resistance of the air) are thrown off from the horizon; but red rays not being bent back in the same way, give a tinge to the evening clouds.
Q. Why are morning clouds generally of a red tinge?