As the amount of water increases, the melting point of rock decreases.  Ian is trying to melt rocks, nothing that the water around the rocks is quite high. Since there is a lot of water around the rocks, the melting point of the rock will be increased or decreased?
decreased

In electromagnetic waves with higher frequencies, photons have more energy.  Don is looking at electromagnetic waves, and sees that the one's he observing have lower frequencies. Don is able to know then that the photons have energy that is higher or lower?
lower

At higher concentrations, particles of reactants are crowded closer together, so they are more likely to collide and react.  DJ has a solution that he adds particles to. The solution is now a higher or lower concentration?
higher

In transipration, at warmer temperatures water molecules move faster, and the rate of evaporation from stomata is therefore much faster.  If Mary decreased the temperature in her greenhouse what would happen to the rate of evaporation from water on her plants it would increase or it would decrease??
it would decrease?