GEOLOGY

Detailed explanation-1: -Water gets colder with depth because cold, salty ocean water sinks to the bottom of the ocean basins below the less dense warmer water near the surface.

Detailed explanation-2: -As you move deeper into the Earth, the pressure increases. Similarly, the deeper you move into the Earth, the temperature increases. Thus, with increasing depth, the pressure and temperature are greater.

Detailed explanation-3: -The temperature of ocean water also varies with depth. In the ocean, solar energy is reflected in the upper surface or rapidly absorbed with depth, meaning that the deeper into the ocean you descend, the less sunlight there is. This results in less warming of the water.

Detailed explanation-4: -The density is directly proportional to mass and inversely proportional to the volume. Therefore, when the volume decreases, the density increases. (iv)Therefore the density increases when the depth increases with the earth.