Which of the following statement s is are correct about ozone layer 1 The ozone layer in the stratos...........

Geography Atmosphere

Which of the following statement/s is/ are correct about ozone layer?

1. The ozone layer in the stratosphere absorbs a portion of the radiation from the Sun called as UVB radiation, preventing it from reaching the Earth's surface.

2. Ozone Depleting Substances (ODS) release chlorine or bromine when they are exposed to intense UV light in the stratosphere.

3. Some natural processes, such as large volcanic eruptions, can have an effect on ozone levels.

4. All chlorine and bromine sources on the earth contribute to ozone layer depletion.

Select the correct answer using the code given below:

1 and 4 only

1, 2 and 3 only

2 and 4 only

1, 2, 3 and 4

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Explanation:

Explanation:

Statement 4. is not correct as not all chlorine and bromine sources contribute to ozone layer depletion. For example, researchers have found that chlorine from swimming pools, industrial plants, sea salt, and volcanoes does not reach the stratosphere. In contrast, ODS are very stable and do not dissolve in rain. Thus, there are no natural processes that remove the ODS from the lower atmosphere.
Also know that- 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 aerosols- small particles or liquid droplets in the atmosphere that can absorb or reflect sunlight depending on their composition (different from consumer products also known as aerosols). 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.