The ozone layer is the high band of gas that blocks harmful sunlight. A hole in the ozone layer.
The hole over Antarctica is closing, because the chemicals that caused it were banned. The ozone layer is the one global environmental problem largely solved.
1nounozone layerThe high band of gas that blocks harmful sunlight.
“The ozone layer sits about twenty kilometres up.”
ozone layer is a layer.
Practised in Weather & Seasons