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:

air moving away from an area of high pressure

Subject:

plates moving away from one another

Subject:

zone of low pressure that occurs at the equator

Subject:

volcanic cone that forms a narrow, high mountain with successive layers of viscous lava; the...

Subject:

a volcano that has not erupted for some time, but there is a possibility that it may still erupt...

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