Why is water important to the health of the planet? Lesson Objectives: To know the main stores and flows of the hydrological cycle To be aware that the hydrological cycle regulates water supply and links the atmosphere, biosphere and lithosphere Topic 4: Water World

Investigation In groups, go outside and pour water onto different surfaces. Observe and record what happens in the back of your books Surface What happened Grass .... Topic 4: Water World

Watch the video and note down the key words that describe what happens when water hits the ground The hydrological cycle can be classed as a system with inputs -> stores -> flows -> outputs Topic 4: Water World

The water cycle – more detailed

The water cycle – definitions!

Drainage basin system interception infiltration surface runoff precipitation interception evapotranspiration infiltration surface runoff throughflow percolation river water table groundwater flow

Drainage basin system inputs precipitation stores and flows interception surface runoff surface water storage soil water storage groundwater storage infiltration groundwater flow throughflow percolation outputs river runoff evaporation transpiration

Drainage basin terms

Drainage basin system

Task Draw a large diagram of the hydrological cycle, making sure all inputs, outputs, flows and stores are clearly labelled. Colour it in after you have done this Homework: Underneath your diagram define each of the key words Topic 4: Water World

Odd one out Percolation Infiltration Precipitation Throughflow Evaporation Interception Source Mouth Confluence Tributaries Channel Distributaries Watershed Catchment River