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Which element makes up the third atom of the ozone molecule?
- Carbon
- Phosphorus
- Oxygen
- Hydrogen
An ozone molecule is made up of three oxygen atoms. It has the chemical formula O3.
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Where is ozone found in most abundance?
- Mesosphere
- Stratosphere
- Troposphere
- Exosphere
The ozone layer is the common term for the high concentration of ozone that is found in the stratosphere around 15–30km above the earth’s surface. It covers the entire planet and protects life on earth by absorbing harmful ultraviolet-B (UV-B) radiation from the sun.
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In which year did scientists find that chlorofluorocarbons were contributing to the depletion of the ozone layer?
- 1985
- 1974
- 1947
- 1958
In 1985, geophysicist Joe Farman, along with meteorologists Brian G Gardiner and Jon Shanklin published findings of abnormally low ozone concentrations above the Antarctic.
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In which atmospheric layer does ozone become toxic?
- Thermosphere
- Troposphere
- Lithosphere
- Stratosphere
In the lower atmosphere (the troposphere) near the Earth’s surface, ozone is created by chemical reactions between air pollutants from vehicle exhaust, gasoline vapours, and other emissions. At ground level, high concentrations of ozone are toxic to people and plants.
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What is the name of the international agreement that agreed to phase out the production and consumption of ozone-depleting substances?
- Convention on Long-Range Transboundary Air Pollution of 1979
- Paris Agreement of 2015
- Kyoto Protocol of 1992
- Montreal Protocol of 1987
The Montreal Protocol on Substances that Deplete the Ozone Layer came into effect in 1987. It sets binding obligations for countries to phase out the production and consumption of all the major ozone-depleting substances.
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