Glossary

A definition will show up in this window whenever you select a key term from an Overview page. You can also find a key term manually by scrolling through the glossary or choosing a letter from the alphabetized menu below.

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Scroll down to see the "J" terms

jet stream

A fast-moving current of air that flows at high elevations.

jetty

A manmade wall that protects the entrance to a harbor.

joints

Naturally formed cracks in rocks.

joint set

A group of systematic joints.

Jovian

A term used to describe the outer gassy, Jupiter-like planets (gas-giant planets).