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a figure of speech which shows an apparent contradiction or disagreement between two words, in...
an atmospheric gas made of three oxygen molecules bonded together (O3).
damage to the ozone layer caused by pollutants such as CFCs.
a layer of ozone gas which occurs naturally in the upper atmosphere, and protects life by...
a lobe-shaped orbital in which electrons may move. There are 3 p orbitals per energy level from...
an artificial device that helps to stimulate and regulate the heart muscle.
the area around the Pacific Ocean that is at the edge of several tectonic plates