The height of victoria's falls is 63   m . What is the difference in the temperature of water at…

Here use the concept of conservation of energy, here potential energy is converted in to heat energy, $\Rightarrow mgh=ms\Delta \theta$, here $m, h \& s$, is the mass of the liquid, height of the fall, and specific heat capacity then, $g\times 63=\Delta \theta \times 4.2\times {10}^3$$\Rightarrow \Delta \theta =0.147°\mathrm{C}$.