Here's why:

* Potential Energy: This is the energy an object has due to its position or configuration. In this case, the diver is elevated above the ground, giving them the potential to convert that height into motion.

* Gravitational Potential Energy: This is the specific type of potential energy related to an object's position in a gravitational field. The higher the diver is, the more gravitational potential energy they have.

As the diver jumps off the cliff:

* They convert their potential energy into kinetic energy (energy of motion).

* The higher the cliff, the faster they'll be moving when they hit the water, indicating a greater conversion of potential to kinetic energy.

Important Note: There are also other minor energy considerations, like the energy the diver used to climb the cliff and the energy they expend during the jump itself. However, the dominant energy form at the top of the cliff is potential energy.