Sоme mаteriаl оbjects аre transparent tо certain forms of electromagnetic waves but opaque to other forms. Earth's atmosphere is an example. The atmosphere allows visible light to pass through it. Much of the more damaging portion of the ultraviolet spectrum is blocked by a thin layer of ozone in the stratosphere. The atmosphere is said to be ____________________________ [transparent] (transparent or opaque) to visible light but ____________________________ [opaque] (transparent or opaque) to ultraviolet light.