Effective inquiry questions are open-ended: questions for which there is not just one right answer.

Why should they be open-ended? What makes a good question? Jot down some ideas before you look at the following list.

A good question is an invitation to think (not recall, summarize, or detail).
A good question comes from genuine curiosity and confusion about the world.
A good question makes you think about something in a way you never considered before.
A good question invites both deep thinking and deep feelings.
A good question leads to more good questions.
A good question asks you to think critically, creatively, ethically, productively, and reflectively about essential ideas in a discipline.

Source: blogs.ubc.ca/stevemcg/files/2014/09/inquiry-questions.pdf, IQ: A Practical Guide to Inquiry-Based Learning. Oxford University Press. Watt, Jennifer & Colyer, Jill.