Multiple choice

Aeroplanes generally fly in the

  1. troposphere

  2. stratosphere

  3. mesosphere

  4. thermosphere

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Commercial aircraft cruise in the lower stratosphere (typically 9-12 km altitude). This layer is above the turbulent troposphere and its weather systems, providing smoother flight conditions and better fuel efficiency for long-haul flights.