Question

Identify the correct statements:

1. The mesosphere ends at the mesopause, around 80 km altitude.

2. The temperature in the mesosphere increases with height.

3. The mesosphere is the coldest layer of the atmosphere.

• A. 1 & 2
• B. 2 & 3
• C. 1 & 3
• D. All are correct

Answer 1

Answer:

C. 1 & 3

• Correct Answer : Option C) 1 & 3

• The mesosphere is the third layer of Earth's atmosphere, located between the stratosphere and the thermosphere.

• Statement 1: The mesosphere ends at the mesopause, around 80 km altitude.

• This statement is correct. The mesosphere extends from about 50 km to 80-85 km above Earth's surface. The upper boundary of the mesosphere is called the mesopause, which occurs at approximately 80 km altitude.

  Statement 2: The temperature in the mesosphere increases with height.

• This statement is incorrect. In the mesosphere, temperature actually decreases with increasing altitude. This is the opposite of what happens in the stratosphere above it. The temperature drops from about -3°C at the bottom of the mesosphere to as low as -90°C at the mesopause.

• Statement 3: The mesosphere is the coldest layer of the atmosphere.

• This statement is correct. The mesosphere contains the coldest temperatures in the entire atmosphere, with temperatures reaching as low as -90°C (-130°F) at the mesopause. This makes it colder than any other atmospheric layer.