What travels across the united states bringing a weather pattern that lasts several days and is predictable

Ronald wants to see if a new shower cleaner works better in removing soap than his old cleaner. he uses the new cleaner on one half of the shower tiles and his old cleaner on the other half. identify the independent and dependent variables in this experiment. enter your answer in the space provided.

How does photosynthesis show the conservation of mass and energy?

Climate like that in the sahara desert have the fastest rates of weathering