5 Describe how seawater forms layers

The ocean forms layers because the water has different density throughout. 2. Water with higher density sinks to the bottom while water with lower density sits on the top. ... Low-density water tends to be warmer and less saline, while high-density water is generally cooler and more saline.

Explanation:

Statement 1 is true because the object can do mechanical work on expense of kinetic energy or potential energy. E.g moving water (has both kinetic energy and potential energy) can rotate the blades of a turbine, thus does mechanical work which converts into electrical energy finally.

Statement 2 is true because kinetic+ potential energy defines the temperature of the object. E.g for an ideal gas pV = NkT, p is the pressure which the molecules of the gas exert on the walls of the container.So, the pressure p is actually rate of momentum transferred per unit area of the walls. This momentum of particles corresponds to their kinetic energy. Similarly, for an interacting (non-ideal) gas or liquid or solid, the potential energy of interaction of particles is also responsible for temperature.

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