It starts at the Earth's surface and extends 8 to 14.5 kilometers high ( 5 to 9 miles). This part of the atmosphere is the densest. Almost all weather is in this region. Which layer is this?

The correct answer is Troposphere.

Key Points

• The Troposphere is the lowest layer of the Earth's atmosphere.
• It extends from the Earth's surface up to about 8 to 14.5 kilometers high (5 to 9 miles).
• This layer is the densest part of the atmosphere.
• Almost all weather phenomena such as clouds, rain, and storms occur in the troposphere.
• The temperature in the troposphere decreases with altitude.
• It contains approximately 75% of the atmosphere's mass and 99% of its water vapor and aerosols.

 Additional Information

• Exosphere
  • The Exosphere is the outermost layer of the Earth's atmosphere.
  • It extends from about 700 kilometers above the Earth to the edge of space.
  • This layer has very thin air and is where the atmosphere transitions into outer space.
• Stratosphere
  • The Stratosphere is the second layer of the Earth's atmosphere.
  • It extends from about 10 to 50 kilometers above the Earth's surface.
  • This layer contains the ozone layer, which absorbs and scatters ultraviolet solar radiation.
  • The temperature in the stratosphere increases with altitude.
• Thermosphere
  • The Thermosphere is located above the mesosphere and below the exosphere.
  • It extends from about 80 kilometers to 700 kilometers above the Earth's surface.
  • This layer has very high temperatures which can rise up to 2,500°C or higher during the day.
  • The International Space Station orbits within this layer.