Glossary

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Looking for a quick definition?

We’ve got loads of key subject terms in our subject glossaries. There are three ways of finding what you are looking for:

  • First click on the letters of the alphabet to browse for terms.
  • Select a subject from the drop-down menu above to filter the terms by Subject.
  • Or lastly, type the term you are looking for into the search box.

EXAMPLES

Here are some examples of the kinds of definitions you’ll find on this page.

Subject:

the thin, protective layer of gases around the Earth.

the gaseous envelope that surrounds the Earth.

Subject:

layer of air surrounding Earth

Subject:

pressure exerted by the mass of the atmosphere; the weight of the atmosphere on Earth's surface...

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