ozokerite
— Noun
– English
~ a waxy mineral that is a mixture of hydrocarbons and occurs in association with petroleum; some varieties are used in making ceresin and candles
ozone hole
— Noun
– English
~ an area of the ozone layer (near the poles) that is seasonally depleted of ozone
ozone
— Noun
– English
~ a colorless gas (O3) soluble in alkalis and cold water; a strong oxidizing agent; can be produced by electric discharge in oxygen or by the action of ultraviolet radiation on oxygen in the stratosphere (where it acts as a screen for ultraviolet radiation)
ozone layer
— Noun
– English
~ a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun