Geography College

The stratospheric ozone ( o 3 ) layer helps to protect us from harmful ultraviolet radiation. it does so by absorbing ultraviolet light and falling apart into an o 2 molecule and an oxygen atom, a process known as photodissociation. o 3 (g)→ o 2 (g)+o(g)

Answers

Answer 1
Final answer:

The stratospheric ozone layer located in the earth's upper atmosphere absorbs harmful ultraviolet radiation from the sun, breaking into an O2 molecule and a single oxygen atom. This protective layer has been depleted by man-made emissions of chlorofluorocarbons (CFCs), leading to efforts to phase out such harmful substances and halt further depletion.

Explanation:

The stratospheric ozone (O3) is a form of oxygen that resides in the stratosphere, a layer of the atmosphere extending from about 10 to 50 kilometers above the earth's surface. This ozone layer is essential for life on Earth as it absorbs the harmful ultraviolet radiation from the sun through a process called photodissociation. In this process, O3 absorbs UV light and breaks down into an O2 molecule and a singular oxygen atom: O3 (g) → O2 (g) + O(g).

In the 1980s, it became clear that human activities, specifically the production of chlorofluorocarbons (CFCs), were depleting this critical ozone layer. This discovery sparked international action, leading to the phase-out of CFCs in industrial applications. As a result, there has been a halt in the loss of atmospheric ozone, and the well-known "ozone hole" over the Antarctic is gradually shrinking.

Ozone's role in absorbing UV radiation is pivotal as it prevents the potential cell damage that UV light can cause on Earth. Without the ozone layer, the harmful effects of UV radiation, such as increased cases of skin cancer and other health risks, would be more prevalent.

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Related Questions

Which of the following has been proposed as a potential strategy for mitigating the increase of co2 in the atmosphere ?
- add aerosol to the atmosphere
- inject into geologic formation
- add iron to the ocean to increase phytoplankton
-shoot it into space
- all of the above

Answers

Injecting into geological formation, adding iron to the ocean to increase phytoplankton, and shooting into space

All of the above proposed methods are being proposed to help decrease global warming but adding aerosols into the atmosphere does not involve the mitigation of the increase in CO2 in the atmosphere. 

1. Adding aerosol to the atmosphere - aerosols added to the atmosphere have the potential to block the sun's rays and reduce global warming. They reflect the sun's rays back to the atmosphere while at the same time providing "seeds" around which water droplets can come together to form clouds. Cloud formation can also help increase the earth's reflectivity against the sun's rays.

2. Injecting into geological formation - carbon dioxide from stationary sources (e.g. powerplants and factories) can be captured and eliminated from the atmosphere, compressed into a fluid state, and injected deep underground into permeable and porous geological formations and overlain with a layer of impermeable rock to seal the CO2 underground. 

3. Adding iron to oceans to increase phytoplankton - phytoplanktons take up carbon dioxide from the atmosphere for photosynthesis. Thus, adding iron to the oceans, which acts as a fertilizer to the phytoplanktons, can encourage the growth of the phytoplankton population. The more phytoplanktons, the more CO2 that can be removed from the atmosphere. 

4. Shoot it into space - some scientists propose that a conveyor can be built in the Arctic to take advantage of the Earth's magnetic field and allow for the venting or expelling of CO2 into outer space. 
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