What are TWO ways in which changes on the earth's surface are connected to changes below the earth's surface

After cloud droplets form, what must happen to them for precipitation to occur?

Compare and contrast physical changes with chemical changes.

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.