This Ozone part contains the gas known as .............. .
oxygen gas
ozone gas
oxide gas
methane
This layer is located at the ............... of the stratosphere.
upper
middle
bottom
above
They discovered this layer in .............. .
1958
1908
1982
1988
By ultraviolet light, ............... gas is converted to ozone gas.
oxygen
carbon
nitrogen
This Ozone hole appears above the Antarctic on ................ of each year.
eighth and ninth
fifth and fourth
first and second
third and fourth
This Ozone hole disappears in ............... .
December
November
October
May
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