How does wind change the shape of earth surface?

What is a scientific theory? a. a scientist's guess about how something works b. the results of an experiment obtained using the scientific method c. a proven fact that will never change d. an idea that is backed by data from many sources

In an exothermic reaction the bonding energy of the product is: less than the reactants same as the reactants greater than the reactants dependent upon the presence of a catalyst

If 1.8 l of water is added to 2.5l of a 7.0 molarity koh solution, what is the molarity of the new solution