The correct answer to the question is option 4: Five. The Earth`s atmosphere is divided into five main layers based on their temperature and composition. These layers are the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.

The troposphere is the lowest layer and contains most of the Earth`s weather phenomena. Above the troposphere is the stratosphere, where the ozone layer is located. The mesosphere is the third layer and is characterized by a decrease in temperature with increasing altitude.

The thermosphere is next, and it is where the Northern and Southern Lights occur. Finally, the outermost layer is the exosphere, which gradually merges with space.

Each of these layers has unique characteristics and plays an important role in influencing the Earth`s climate and weather patterns.