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The correct answer is option 4: Stratosphere.
The ozone layer is a protective layer of ozone gas that is found in the stratosphere, which is the second layer of the Earth`s atmosphere. The stratosphere is located above the troposphere, which is the lowest layer of the atmosphere where weather occurs.
The ozone layer plays a crucial role in protecting life on Earth by absorbing most of the sun`s harmful ultraviolet (UV) radiation. UV radiation can cause skin cancer, damage to the eyes, and harm ecosystems. The ozone layer acts as a shield by absorbing and blocking a significant portion of these harmful UV rays from reaching the Earth`s surface.
It should be noted that the other options are incorrect. The ionosphere is part of the thermosphere and plays a role in the auroras. The troposphere is where weather occurs and does not contain the ozone layer. The mesosphere is the third layer of the atmosphere and is located above the stratosphere.