Models such as stream tables can represent real-world processes. Various Martian landforms seem to support the idea that water flowed across the surface. Skill Goals Observing and recording the features created by the flowing water. Hypothesizing about the effects of using different angles, amounts of water, and rates of release, and then testing these ideas through experimentation. Possible Misconceptions River beds are commonly quite steep, certainly above 10 degrees.
Water alters the land only minimally.
Be sure both sides have zero at the same end of the tray.