Which is the second layer of the atmosphere as listed?

Which is the second layer of the atmosphere as listed?

• A. Troposphere
• B. Ionosphere
• C. Stratosphere
• D. Mesosphere

Answer: (B)

In the standard listing of atmospheric layers from Earth’s surface upward, the first layer is the troposphere, and the second is the stratosphere. The stratosphere sits above the troposphere and contains the ozone layer, which absorbs UV radiation and causes a temperature increase with altitude in that layer. The ionosphere, while an important region of the upper atmosphere where gas is ionized and which affects radio waves, is not counted as one of the primary layers in this basic ordering.

In the standard listing of atmospheric layers from Earth’s surface upward, the first layer is the troposphere, and the second is the stratosphere. The stratosphere sits above the troposphere and contains the ozone layer, which absorbs UV radiation and causes a temperature increase with altitude in that layer. The ionosphere, while an important region of the upper atmosphere where gas is ionized and which affects radio waves, is not counted as one of the primary layers in this basic ordering.