| GLOSSARY |
Our comprehensive earth science glossary is available to assist in your understanding of the MY NASA DATA microsets, lesson plans and computer tools. Please select the first letter of the word you wish to check for a definition and further information. |
| U |
| ultraviolet radiation: |
| shortwave electromagnetic waves having wavelengths between 0.1 and 0.4 micrometers; ultraviolet (UV) radiation from the sun is significantly absorbed by the ozone layer in the stratosphere. It is harmful to plants and animals, including humans.
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Image courtesy NASA Mission to Planet Earth |
| U |
| upwelling: |
| ocean circulation which brings cold, nutrient-rich deep water to the surface, usually occurring along western coasts of continents.
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Image courtesy NASA Mission to Planet Earth |
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