OZONE LAYERS: definition and effect.

Definition:

The ozone layer or ozone shield is a region of Earth’s stratosphere that absorbs most of the Sun’s ultraviolet radiation. It contains high concentration of ozone (O3) in relation to other parts of the atmosphere, although still small in relation to other gases in the stratosphere.

How many ozone layers are there?

The ozone layer is mainly found in the lower portion of the stratosphere, from approximately 15 to 35 kilometers (9.3 to 21.7 mi) above Earth, although its thickness varies seasonally and geographically

more on: global warming

What is destroying the ozone layer?

Gaseous CFCs can deplete the ozone layer when they slowly rise into the stratosphere, are broken down by strong ultraviolet radiation, release chlorine atoms, and then react with ozone molecules. See Ozone depleting substance.) as aerosol.

Which country is mainly responsible for ozone hole?

The ozone hole over Antarctica is usually more pronounced on the South American side of the frozen continent. Countries that are affected by it the most are Argentina, Chile, South Africa, New Zealand and Australia. The largest ozone hole ever observed in the Antarctic was reported by NASA in September 2000.

Where on earth is the ozone layer thinning?

Ozone depletion, gradual thinning of Earth’s ozone layer in the upper atmosphere caused by the release of chemical compounds containing gaseous chlorine or bromine from industry and other human activities. The thinning is most pronounced in the polar regions, especially over Antarctica.

How does the ozone layer breakdown?
Ozone depletion occurs when chlorofluorocarbons (CFCs) and halo degases formerly found in aerosol spray cans and refrigerant share released into the atmosphere (see details below). … CFCs and Hanlons cause chemical reactions that break down ozone molecules, reducing Ozone’s ultraviolet radiations absorbing capacity.

Which of the following reacts with ozone to form oxygen?

These two reactions form the ozone oxygen cycle, in which the chemical energy released when O and O2 combine is converted into kinetic energy of molecular motion. The overall effect is to convert penetrating UVB light into heat, without any net loss of ozone.

Which gas is used in refrigerator?
Modern refrigerators usually use are frigerant called HFC-134a (1,1,1,2-Tetra fluoride thane), which does not deplete the ozone layer, instead of freon. A R-134a is now becoming very uncommon in Europe. Newer refrigerants are being used instead.

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