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This Concept Map, created with IHMC CmapTools, has information related to: Bencar.hydrocmap.jpg, Transparency Tube is used to determine how much soil and substrate, Hydrological Measurements such as nitrates, Hydrology is predicted and observed by scientists and GLOBE students and teachers, Thermometer to determine the temperature, soil and substrate is in a sample of water, water this helps to determine the health, Hydrological Measurements such as D.O., GLOBE subjects which include atmosphere, LaMotte Dissolved Oxygen Kit is used to find out how much dissolved oxygen, scientists and GLOBE students and teachers who use various Hydrological Instruments, Hydrological Instruments such as Conductivity Meter, pH which is taken by using a pH Meter, acidity in a liquid, Hydrological Instruments such as Thermometer, Hydrology is the study of Earth's water resources, GLOBE subjects which include carbon, Hydrological Instruments such as pH Meter, Hydrological Instruments such as Transparency Tube, directions to properly use Hydrological Instruments, Hydrological Procedures which include directions