layer

Because of the district’s size, it has its own Office of Environment Health and Safety to add a layer of scrutiny.

Waste containing asbestos is sealed into two layers of polyurethane bags and then into a plastic container with a lid, she said, while liquids such as bleach and motor oil are poured into drums.

If that first layer of homes is ignited, you’ve already sort of lost the battle.

The family returned to find their house and garden covered in a layer of ash.

But scientists quickly realized that question could only be answered by studying the interconnected layers of the broader marine ecosystem.