This is not the consequence of ozone layer depletion

The correct option is "tides".

To understand why this is the correct choice, let us examine the relationship between the depletion of the ozone layer and each of the provided options:

1. Ozone Layer Depletion and its Consequences:
The ozone layer in the Earth's stratosphere absorbs the majority of the harmful ultraviolet (UV) radiation coming from the Sun, particularly UV-B rays. When the ozone layer is depleted, a higher amount of UV radiation reaches the Earth's surface. This leads to several direct environmental and health consequences:
- Malignant Melanoma (Skin Cancer): Increased exposure to UV radiation damages DNA in skin cells, which directly increases the risk of skin cancers, including malignant melanoma. Thus, skin cancer is a direct consequence of ozone depletion.
- Increased Ultraviolet Radiations: The depletion of ozone directly allows more ultraviolet radiation to penetrate the atmosphere and reach the surface. Thus, increased UV radiation is the primary consequence of ozone depletion.
- Effects on Cyanobacteria: Cyanobacteria (photosynthetic bacteria) are highly sensitive to UV radiation. An increase in UV rays damages their photosynthetic apparatus, inhibiting their growth and affecting food chains. Thus, this is also a direct consequence of ozone depletion.

2. Why Tides are Not a Consequence:
Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun, as well as the rotation of the Earth. Tides are gravitational and astronomical phenomena and are completely unaffected by chemical changes in the atmosphere, such as the concentration of stratospheric ozone.

Therefore, tides is the only option that is not a consequence of ozone layer depletion.