More than 6,000 entries on "topics including climatology, economic geology, geochemistry, oceanography, palaeontology, petrology, and volcanology" as well as "planetary science, remote sensing, statistics, and sequence stratigraphy, wind strength scales, material, temporal, and chronostratigraphic units, geologic, lunar, and Martian time scales...

Dictionary that "provides entries on all aspects of ecology and the environmental sciences...

More than 1,300 entries covering "all areas of science, from physics and astronomy to medicine and ecology, including key figures in the fields of mathematics and technology...

Online encyclopedia covering many areas in the sciences: chemistry, computer science, earth science, environmental science, forensic science, mathematics, physics, space and astronomy, and weather and climate...