What you’ll learn6 learning objectivesChoose one objective for a focused lesson, or study the complete topic.4.1.1Water movement drivers• Solar radiation and gravity• Heat for evaporation, gravity for drainageSyllabus objective4.1.2Hydrological cycle• System with stores and flows• Stores: boxes; flows: arrowsSyllabus objective4.1.3Hydrological cycle stores• Oceans (96.5%), glaciers/ice caps (1.7%), groundwater (1.7%)• Surface freshwater (0.02%), atmosphere (0.001%), organisms (0.0001%)Syllabus objective4.1.4Hydrological cycle flows• Transpiration, sublimation, evaporation, condensation, advection, precipitation• Melting, freezing, run-off, infiltration, percolation, streamflow, groundwater flowSyllabus objective4.1.5Human activity impacts• Agriculture, deforestation, urbanization alter flows and stores• Reduced evapotranspiration, increased run-off → flash floodsSyllabus objective4.1.6Water body steady state• Flow diagrams of inputs and outputs• Calculate sustainable harvesting ratesSyllabus objective