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ozone after it was liberated from CFCs by UV radiation. Free chlorine atoms and chlorine-containing gases, such as chlorine monoxide , could then break ozone molecules apart by stripping away one of the three oxygen atoms. Later research revealed that bromine and certain bromine-containing compounds, such as bromine monoxide , were even more effective at destroying ozone than were chlorine and its reactive compounds. Subsequent laboratory measurements, atmospheric measurements, and atmospheric-modeling studies soon substantiated the importance of their findings. Crutzen, Molina, and Rowland received the Nobel Prize for Chemistry in 1995 for their efforts. Some natural processes, such as large volcanic eruptions, can have an indirect effect on ozone levels. For example, Mt. Pinatubo’s 1991 eruption did not increase stratospheric chlorine concentrations, but it did produce large amounts of tiny particles called aerosolsaerosolsSmall particles or liquid droplets in the atmosphere that can absorb or reflect sunlight depending on their composition. . These aerosols increase chlorine’s effectiveness at destroying ozone. The aerosols in the stratosphere create a surface on which CFC-based chlorine can destroy ozone. However, the effect from volcanoes is short-lived. The Earth’s atmosphere is composed of several layers. The lowest layer, the tropospheretroposphereThe region of the atmosphere closest to the Earth. The troposphere extends from the surface up to about 10 km in altitude, although this height varies with latitude. Almost all weather takes place in the troposphere. Mt. Everest, the highest mountain on Earth, is only 8 km high. Temperatures decrease with altitude in the troposphere. As warm air rises, it cools, falling back to Earth. This process, known as convection, means there are huge air movements that mix the troposphere very efficiently., extends from the Earth’s surface up to about 6 miles or 10 kilometers in altitude. Virtually all human activities occur in the troposphere. Mt. Everest, the tallest mountain on the planet, is only about 6 miles high. The next layer, the stratospherestratosphereThe region of the atmosphere above the troposphere. The stratosphere extends from about 10km to about 50km in altitude. Commercial airlines fly in the lower stratosphere. The stratosphere gets warmer at higher altitudes. In fact, this warming is caused by ozone absorbing ultraviolet radiation. Warm air remains in the upper stratosphere, and cool air remains lower, so there is much less vertical mixing in this region than in the troposphere., continues from 6 miles to about 1 miles . Most commercial airplanes fly in the lower part of the stratosphere. The global community has taken action to restore the ozone layer. The Montreal Protocol on Substances that Deplete the Ozone Layer came into effect in 198 It commits countries to phasing out production and import of all the major ozone depleting

the pittsburgh penguins nhl full printing flip flops 2
the pittsburgh penguins nhl full printing flip flops 2

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