See the related questions section below.
Chlorofluorocarbons
Chemicals contain CFC's. They are the primary reason of depletion.
Chlorine causes the ozone depletion. It reacts with ozone to deplete it.
The primary reason is the use of CFC's. They react with ozone to deplete it.
You need to say what you need primary material on - otherwise the question is unanswerable.
primary material for what? clothing, tools, etc.?
Material.
Steel was the primary construction material during the Second Industrial Revolution.
Primary Industries are those which harvest the raw-material from nature.
The nucleolusâ??s primary function is to synthesize mRNA, rRNA and ribosome in living cells. According to scientists, more than 50% of RNA is synthesized in the nucleolus.
Recording and studying data is the primary way scientists can find out things about the world.
CFC's are the primary culprits for depletion. The get in the stratosphere by the westerly winds.