Which among the following is the highest layer of atmosphere when measured from the sea level?

Option 1: Stratosphere -> Second layer from sea level, extends from about 12 to 50 km above Earth's surface.

Option 2: Mesosphere -> Third layer from sea level, extends from about 50 to 80 km above Earth's surface.

Option 3: Exosphere -> Outermost and highest layer, extends from about 700 km to 10,000 km above Earth's surface.

Option 4: Troposphere -> Lowest layer closest to sea level, extends from surface to about 12 km altitude.

Hence, Exosphere -> The atmospheric layers in order from sea level are: Troposphere, Stratosphere, Mesosphere, Thermosphere, and Exosphere. The exosphere is the uppermost layer where atmospheric particles gradually merge with outer space -> correct