We should do more to protect the ozone layer from further damage.
Since it was getting even hotter, Tom peeled off another layer of clothing.
I wear many layers of clothing.
When inserting the budwood into the root stock make the cambium layer overlap.
This is a layer of soil that is permanently frozen, and in some places it's many feet deep.
We call these slabs of the solid-rock layer 'plates'.
This chart illustrates the function of ozone layer.
Remove the lower-most background layer.
This debate about the future of the ozone layer has been mostly about profits and politics.
It is impossible to burn a copy of Dante's Inferno because the ice of the ninth layer of hell will put out any fires kindled with earlier pages.
Sweatshirts will change colour to show it's time to put on another layer.
This cake has 3 layers: a red one, a yellow one and a green one.
A group of researchers has published a report on the ozone layer.
In countries with electoral colleges, citizens vote for representatives to pick heads of state for them, adding an extra layer to what would otherwise be a direct election.