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  2. Oxygen cycle - Wikipedia

    en.wikipedia.org/wiki/Oxygen_cycle

    The oxygen cycle demonstrates how free oxygen is made available in each of these regions, as well as how it is used. The oxygen cycle is the biogeochemical cycle of oxygen atoms between different oxidation states in ions, oxides, and molecules through redox reactions within and between the spheres/reservoirs of the planet Earth. [1]

  3. Ozone–oxygen cycle - Wikipedia

    en.wikipedia.org/wiki/Ozone–oxygen_cycle

    If an oxygen atom and an ozone molecule meet, they recombine to form two oxygen molecules: 4. ozone conversion: O 3 + O → 2 O 2. Two oxygen atoms may react to form one oxygen molecule: 5. oxygen recombination: 2O + A → O 2 + A as in reaction 2 (above), A denotes another molecule or atom, like N 2 or O 2 required for the conservation of ...

  4. Ground-level ozone - Wikipedia

    en.wikipedia.org/wiki/Ground-level_ozone

    The radical adduct (•HOCO) is unstable and reacts rapidly with oxygen to give a peroxy radical, HO 2 •: •OH + CO → •HOCO •HOCO + O 2 → HO 2 • + CO 2. Peroxy-radicals then go on to react with NO to produce NO 2, which is photolysed by UV-A radiation to give a ground-state atomic oxygen, which then reacts with molecular oxygen to ...

  5. Ozone - Wikipedia

    en.wikipedia.org/wiki/Ozone

    Then, the oxygen from the first step is an intermediate because it participates as a reactant in the second step, which is a bimolecular reaction because there are two different reactants (ozone and oxygen) that give rise to one product, that corresponds to molecular oxygen in the gas phase.

  6. Ozone layer - Wikipedia

    en.wikipedia.org/wiki/Ozone_layer

    Ozone-oxygen cycle in the ozone layer. The photochemical mechanisms that give rise to the ozone layer were discovered by the British physicist Sydney Chapman in 1930. Ozone in the Earth's stratosphere is created by ultraviolet light striking ordinary oxygen molecules containing two oxygen atoms (O 2), splitting them into individual oxygen atoms (atomic oxygen); the atomic oxygen then combines ...

  7. The Link Between Air Pollution And Increased Type 2 Diabetes Risk

    www.aol.com/between-air-pollution-increased-type...

    Poor air quality will affect many chronic conditions and, according to the World Health Organization, air pollution has been strongly linked with stroke, heart disease, lung cancer, pneumonia ...

  8. Oxygen isotope ratio cycle - Wikipedia

    en.wikipedia.org/wiki/Oxygen_isotope_ratio_cycle

    Oxygen (chemical symbol O) has three naturally occurring isotopes: 16 O, 17 O, and 18 O, where the 16, 17 and 18 refer to the atomic mass.The most abundant is 16 O, with a small percentage of 18 O and an even smaller percentage of 17 O. Oxygen isotope analysis considers only the ratio of 18 O to 16 O present in a sample.

  9. Voices: Cities are showing what climate leadership looks like

    www.aol.com/news/voices-cities-showing-climate...

    In every way possible, cities are showing what climate leadership looks like. ... , creating the world’s largest clean air zone. We’ve won national park city status, planted more than half a ...

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