The ozone layer protects the Earth from UV radiation by absorbing UV-B rays. It is being depleted by chemicals like CFCs, HCFCs, and other ozone-depleting substances released into the atmosphere by human activities. While volcanoes and oceans release chlorine, the chlorine from natural sources washes out of the atmosphere, unlike the chlorine from industrial chemicals which remains and destroys ozone. International agreements in the late 20th century began regulating and banning ozone-depleting substances to help the ozone layer recover over time.

1. Dávid Tirpák & Matej Kostelník
II.AG

2.  The ozone layer is a
concentration of ozone
molecules in the stratosphere
 The ozone layer protects us
from the Suns UV-B

3.  It is caused by the release of:
 chlorofluorocarbons(CFCs)
 hydrofluorocarbons(HCFCs)
 other ozone-depleting
substances (ODS)

4.  While it is true that volcanoes and oceans
release large amounts of chlorine, the
chlorine from these sources is easily dissolved
in water and washes out of the atmosphere in
rain

5.  In 1978, the use of CFC propellants in spray
cans was banned in the U.S.
 In the 1980s, the Antarctic “ozone hole”
appeared and an international science
assessment more strongly linked the release
of CFCs and ozone depletion

6.  The answers in order are: yes and no.
 We can't make enough ozone to replace
what's been destroyed, but provided that we
stop producing ozone-depleting substances