Hydrosphere ImageWater participates in many important natural chemical reactions and is a good solvent. Changing any part of the Earth system, such as the amount or type of vegetation in a region or from natural land cover to an impervious one, can affect the rest of the system. Rain and snow capture aerosols from the air. Acidic water slowly dissolves rocks, placing dissolved solids in water. Dissolved or suspended impurities determine water's chemical composition. Current measurement programs in many areas of the world cover only a few water bodies a few times during the year. GLOBE students provide valuable data to help fill these gaps and improve our understanding of Earth's natural waters.

Students and scientists investigate hydrology through the collection of data using measurement protocols and using instruments which meet certain specifications in order to ensure that data are comparable. Learning activities aid in the understanding of important scientific concepts, the understanding of data and data collection methodologies. The Investigation appendix contains data sheets for all hydrology protocols, a hydrology site map template and a glossary of terms. Additionally, data sheets (from the Appendix) and field guides (from the individual protocols) are available individually.

The GLOBE Hydrology investigation is available in the six United Nations languages (select any of the following links to open the corresponding document): Arabic (2005 edition), Chinese (1997 edition), French (2005 edition), Portuguese (1997 edition), Russian (1997 edition), and Spanish (2005 edition).

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General Hydrosphere Documents