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Learn about the GLOBE Program student investigations that explore the Earth’s hydrosphere - the water component of our planet, including liquid water, ice and vapor. 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, and water plays a role in many of these changes. 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. Water is a good solvent and participates in many of the chemical reactions that take place in the Earth system. Water provides a habitat for mosquito larvae. GLOBE eTraining provides the opportunity for new and existing GLOBE users to complete science protocol training online and consists of downloadable training modules, interactive digital field and lab experiences, and online assessments for each module. GLOBE (Global Learning and Observation to Benefit the Environment) is a worldwide, hands-on, K-12 school-based science education program.