Which layer of the earth's atmosphere contains the ozone layer?

A. Troposphere
B. Mesosphere
C. Ionosphere
D. Stratosphere
Answer» D. Stratosphere
Explanation: The ozone layer is a region of Earth's stratosphere. It is mainly found in the lower portion of the stratosphere, from approximately 20 to 30 kilometres (12 to 19 mi) above Earth. The ozone layer absorbs 97 to 99 percent of the Sun's medium-frequency ultraviolet light (200 nm to 315 nm wavelength), which other-wise would be harmful to exposed life forms on the earth.
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