[DOC] [TLE] CFCs - The Ozone Hole [PAR] One of the elements that make up CFCs is chlorine. ... The ultraviolet radiation at 
this altitude breaks down CFCs, freeing the chlorine. ... began in the late 1970s 
after the first warnings of damage to stratospheric ozone were published. ... in the 
lower atmosphere, enabling them to break down before reaching the ozone layer
. [DOC] [TLE] chlorofluorocarbons facts, information, pictures | Encyclopedia.com ... [PAR] Chlorofluorocarbons (CFCs) are a class of chemicals that contain only atoms of 
carbon, ... would then react with stratospheric ozone, breaking it down into 
oxygen. ... The one exception to this is the potential of all of these compounds, as 
well as ... to refer to those guidelines when editing your bibliography or works 
cited list. [DOC] [TLE] Chlorofluorocarbon - Wikipedia [PAR] A chlorofluorocarbon (CFC) is an organic compound that contains only carbon, 
chlorine, and ... Because CFCs contribute to ozone depletion in the upper 
atmosphere, the .... The value of this equation is always a three figure number. ..... 
in the lower atmosphere, enabling them to break down before reaching the 
ozone layer. [DOC] [TLE] Ozone depletion - Wikipedia [PAR] The Earth's ozone layer is mainly found in the lower portion of the stratosphere 
from approximately 20 to 30 km (12 to 19 mi). Ozone Depletion describes two 
distinct but related phenomena observed since the late 1970's: ... These 
elements are found in certain stable organic compounds, especially 
chlorofluorocarbons,... [DOC] [TLE] CFCs (Chlorofluorocarbons) - water, effects, chemicals, industrial ... [PAR] One U.S. chemical industry gave them the trade name of "Freons," and the term ... 
CFCs are halocarbons that contain only the elements carbon, chlorine, and 
fluorine. ... In the late 1970s, scientists began to realize that CFCs do break down 
in the ... Mild levels of ozone are found at the earths surface in city streets all 
across... [DOC] [TLE] Depletion of the Ozone Layer - Chemistry LibreTexts [PAR] Sep 30, 2014 ... Skip to main content ... Figure 1. These images from the Total Ozone Mapping ... 
They discovered that this process could releasing chlorine radicals that would ... 
react with oxygen molecules (O2) to create ozone (O3) and atomic oxygen (O). .... 
Chlorine initiates the breakdown of ozone and combines with a... [DOC] [TLE] All About Ozone - Fact Monster [PAR] Ozone is a molecule containing three oxygen atoms. ... Over time, CFCs found 
uses as refrigerants, solvents, foam blowing agents, and in other ... Because they 
release chlorine or bromine when they break down, they damage the protective 
ozone layer. ... One chlorine atom can destroy over 100,000 ozone molecules. [DOC] [TLE] Example Essays: Chlorofluorocarbon Chlorine Ozone Layer [PAR] The major cause in the depletion of the Earth"s ozone layer is because of the 
release ... elements chlorine, fluorine, carbon, and sometimes hydrogen that will 
break down ... Volcanically perturbed conditions increase chlorine's breakdown 
of ozone. ... In the 1970's, scientists first discovered that chlorofluorocarbons (
CFC's)... [DOC] [TLE] The Causes of Ozone Depletion - BC Air Quality [PAR] These chemicals are called "ozone-depleting substances" ... However, their very 
stability allows them to float up, intact, ... A single molecule of chlorine can break 
apart thousands of ... The main ODS are chlorofluorocarbons (CFCs), ... Found in 
industrial solvents, dry-cleaning agents and... [DOC] [TLE] Ozone Layer Protection | US EPA [PAR] The emission of ozone depleting substances has been damaging the ozone 
layer. But through domestic and international action, the ozone layer is healing 
and... [DOC] [TLE] The Ozone Hole - University of St Andrews [PAR] One of the most important filtering effects for life on earth is the reduction of ... 
However, high levels of UV are harmful, causing skin cancers, genetic damage 
and climate change. ... The main natural catalysts for ozone destruction are: ... 
CFCs are very susceptible to breakdown under UV radiation, releasing chlorine 
and... [DOC] [TLE] The Ozone Layer: Our Global Sunscreen - American Chemical Society [PAR] By the

Question: In the 1970s it was found that when CFCs break down, this is the main 1 of the 3 elements in them that harms the ozone
Answer: chlorine