The material covered throughout the course is reviewed. Properties of air and water are discussed. Hydrostatic balance is discussed as related to the atmosphere, ocean and solid earth. Geostrophic balance is a force balance between the Coriolis force and the pressure gradient force, and applies to winds in the atmosphere as well as currents in the ocean. Several examples of equilibrium states are reviewed. Heat and mass are transported by fluid motion in the earth system through winds, ocean currents and rivers. Mixing, dilution and concentration is discussed as related to ocean and atmosphere pollutants as well as salinity in the ocean. Finally, symmetry between the northern and southern hemispheres is discussed, focusing on differences in land mass, Coriolis force and the seasons. Complete course materials are available at the Open Yale Courses website: http://oyc.yale.edu This course was recorded in Fall 2011.