Alocal farmer notices that the level of water in the pond behind his house has been going down. temperatures have been very high in the area, but there are also a lot of animals on his farm that may be drinking the water. what is causing the water to go down?

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.