SOLAR SYSTEM

UNIVERSE

ATMOSPHERIC BASIC PROPERTIES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Why are scientists concerned with ozone depletion in the upper atmosphere?
A
because it causes greater levels of ground-level ozone
B
because it allows ultraviolet radiation to reach Earth’s surface
C
because it increases the amount of smog in highly populated cities
D
because it decreases global temperatures by decreasing incoming solar radiation
Explanation: 

Detailed explanation-1: -A diminished ozone layer allows more UV radiation to reach the Earth’s surface. For people, overexposure to UV rays can lead to skin cancer, cataracts, and weakened immune systems. Increased UV can also lead to reduced crop yield and disruptions in the marine food chain.

Detailed explanation-2: -Depletion of this layer by ozone depleting substances (ODS) will lead to higher UVB levels, which in turn will cause increased skin cancers and cataracts and potential damage to some marine organisms, plants, and plastics.

Detailed explanation-3: -The depletion of the ozone layer leads, on the average, to an increase in ground-level ultraviolet radiation, because ozone is an effective absorber of ultraviolet radiation. The Sun emits radiation over a wide range of energies, with about 2% in the form of high-energy, ultraviolet (UV) radiation.

Detailed explanation-4: -How do these chemicals deplete ozone? When a CFC molecule reaches the stratosphere, it eventually absorbs UV radiation, causing it to decompose and release its chlorine atoms. One chlorine atom can destroy up to 100, 000 ozone molecules.

Detailed explanation-5: -Q17: Does depletion of the ozone layer increase ground-level ultraviolet radiation? Yes, ultraviolet radiation at Earth’s surface increases as the amount of overhead total ozone decreases, because ozone absorbs ultraviolet radiation from the Sun.

Detailed explanation-6: -Stratospheric ozone is formed naturally through the interaction of solar ultraviolet (UV) radiation with molecular oxygen (O2). The “ozone layer, ‘’ approximately 6 through 30 miles above the Earth’s surface, reduces the amount of harmful UV radiation reaching the Earth’s surface.

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