Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Thermosphere is the upper-most atmosphere.
What is the upper-most atmosphere known as?

Based on the passage, they may represent individual people is one conclusion archaeologists have reached about the statues.
Based on the passage, what is one conclusion archaeologists have reached about the statues?

Ground tilting is caused by the buildup of stress in the rocks.

What is caused by the buildup of stress in the rocks?