How is a waterfall a natural resource?

What percentage of energy is passed from level to level of a food chain or web? Biggest ship builder in the world? What are living and nonliving things in an estuary? Is water non electrolyte? Where is the common place to migrate for people? What dose the type of age of rocks found in the mountain's mean? What did the US government do of the dust bowl? Which is more likely to change a scientific theory or a scientific law? Does cellular respiration take place in nearly all life? How can you increase density if mass is constant? Which are more likely to be studied by chemistry? What two colors may be used for the ground conductor neutral? What is chemical symbol H5O? How many trees are planted on earth day? What is the formula for pentafluoride? How are non-material goals important? What are the common characteristics of common bacteria? What purpose does a symbol serve on a map? Why is helium the preferred gas when filling balloons to entertain children? Which plate boundary and movement commonly create volcanoes that can result in the development of habitable islands Explain how islands can be created by plate tectonics?