13) Which body glows with electromagnetic waves? A) Earth B) both C) the sun D) neither 14) Glowing plasma is evident in the light from A) a fluorescent lamp. B) the aurora borealis (northern lights). C) an incandescent lamp. D) both a and b. E) both a and c. 15) Atmospheric pressure is caused by the A) weight of the atmosphere. B) temperature of the atmosphere. C) effect of the sun”s energy on the atmosphere. D) density of the atmosphere.