Noctilucent Clouds are:

  1. horizontal clouds formed in troposphere
  2. associated with thunderstorms and atmospheric instability

  Which of the above statements is/are correct?

Answer: [D] Neither 1 nor 2

First statement is incorrect because noctilucent clouds are the highest clouds in Earth's atmosphere, located in the mesosphere at altitudes of around 76 to 85 kilometres.They are composed of tiny crystals of water ice up to 100 nm in diameter. They are not associated with thunderstorms and atmospheric instability.

This question is a part of GKToday's Integrated IAS General Studies Module