Given a statement, generate a question such that the answer is contained in that statement.

Q: Tests are often done during science classes

A: What is often done during science classes?
****
Q: When the planet was buried in snow and ice it was known as the glacial eras

A: What era was the planet known as when it was buried in snow and ice?
****
Q: some rain can changes the hue of litmus paper from blue to red

A:
What color of litmus paper can be changed by rain?
****