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Earthshots is a collection of Landsat images and text, designed to show environmental changes and to introduce remote sensing. From the U.S. Geological Survey's Earth Resources Observation and Science Center (EROS).

Speleogenesis.info, an official site of the UIS Commission on Karst Hydrogeology and Speleogenesis. The goal of the Commission is to promote scientific cooperation and research in karst hydrogeology, with special emphasis to speleogenesis as the core problem of permeability development in karst aquifers and their overall evolution.

Society for the advancement of mineralogy, crystallography, geochemistry, and petrology, and promotion of their uses in other sciences, industry, and the arts.

Online Dictionary - Multiple dictionaries including: English dictionary, medical dictionary, legal dictionary, financial dictionary, computer dictionary, thesaurus, dictionary of acronyms and abbreviations, dictionary of idioms, thesaurus, Columbia encyclopedia, Wikipedia encyclopedia, Hutchinson encyclopedia, examples from classic literature, pronunciations, word browser, glossary. Free access

Definition of word from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games.

Extensive on-line galleries of travel, adventure, landscape, and nature photography by QT Luong, featuring thousands of pictures, available as fine art prints or for image licencing.

The National Speleological Society is a not for profit organization dedicated to the study, conservation, exploration and knowledge of caves.