Hydrology
Demonstrations
Density of Solid Water and Solid Oil (Help students understand that it is odd that ice floats.)
Capillary Action (Video Link of how it is done) (Great way to show how this works and how the size of the space affects the height water can climb.) (Works great as a station lab)
Surface Tension with Soap Bubble (Link is for bubble recipe, I do not have a set lab yet. There are some links with potential ideas and discussions.)
Activities
Archimedes Principle (Using densities of salt water and fresh water to explain the movement of water in the Mediterranean Sea)
Graphing Tides: Worksheet, Graph Paper, Tide Data (Any tide data works, I got this data from NOAA)
Lake Turnover (Data for how a lake layers in summer and winter, but can mix in spring and fall)
Cartesian Divers: Instructions, Student Worksheet, Pictures of Setup (Changing density of gas through compression) (What makes something sink or float)