Which of the following questions can be answered scientifically? 1) should we just let the river flow where it wants? 2) what can be done to stop erosion? 3) is erosion control worth the financial costs? 4) can planting cover crops reduce erosion?

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.