How to develop good inquiry questions & what they look like

Here's a great one that's brief but defines the characteristics of a good inquiry and lists techniques you can use to create them.

Here's one about supporting student questioning with some very concrete suggestions about how to support student thinking and student-to-student conversation. It's from a Math classroom. More about problem-solving than building open-ended questions for further exploration.

Here's an exhaustive list of inquiry questions from a science context.