List and discuss general physical characteristics of aquatic biomes. Include salinity, water depth, and water flow. Determine that temperature is not a factor.
Introduce the 2 broad categories, fresh water and marine biomes.
Under fresh water, outline and discuss the characteristics of streams and rivers and creeks. Discus their dependence on terrestrial biomes to provide organic food. Introduce silting, oxygenation of turbulent water and the organisms which adapt to this environment