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:

(also called mass movement) the transfer of rock debris or soil down a slope under the influence...

Subject:

one mass of the same rock that does not have strata or bedding planes

Subject:

(also called average) the sum of a set of quantities divided by the number of quantities in the...

Subject:

weathering of rock as a result of physical processes, such as extreme temperatures and animal...

Subject:

line of longitude

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