Given a scientific passage and an answer, generate a question for the given answer.

[EX Q]: Passage: Telescopes on Earth all have one big problem: incoming light must pass through the atmosphere. This blocks some wavelengths of radiation. Also, motion in the atmosphere distorts light. You see this when you see stars twinkling in the night sky. Many observatories are built on high mountains. There is less air above the telescope, so there is less interference from the atmosphere. Space telescopes avoid problems from the atmosphere completely since they orbit outside the atmosphere. Answer: the atmosphere
[EX A]: Many observatories are built on high mountains to avoid interference from what?

[EX Q]: Passage: The cornea is the transparent outer covering of the eye. It protects the eye and also acts as a convex lens, helping to focus light that enters the eye. Answer: cornea
[EX A]: What is the transparent outer covering of the eye?

[EX Q]: Passage: Since we can observe wind forming sand dunes with these patterns now, we have a good explanation for how the Navajo sandstone formed. The Navajo sandstone is a rock formed from ancient sand dunes. The rock shows that the ancient wind direction changed from time to time. Answer: wind
[EX A]:
What forms the changing shapes of sand dunes?