Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. combination inorganic/organic material

Narrower term/s

• air (material)
• ozone layer[+]
  • ozone hole

Anotations

Scope note:

The gas and aerosol envelope that extends from the ocean, land, and ice-covered surface of a planet outward into space; used especially in reference to the earth where it is held by the force of gravity.