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:

a fold in which both the limbs dip in the same direction so that the strata in the middle part...

Subject:

the gradient is such that the river has excess energy and erosion occurs

Subject:

(also called sheetflow) rainwater that flows across the land, not in a specific river channel,...

Subject:

when a population is too dense for the area it lives in, causing overcrowding

Subject:

a gas made up of three molecules of oxygen (O3)

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