Zero Gravity or Micro Gravity

In a lesson this past week, I planted a 'seed' in my students mind by exploring their understanding of gravity. Of course, they are very bright and all know what gravity is experientially. I also asked them, based on their understanding of gravity (not what it really is) if there is such as thing as zero gravity. The answer was a resounding yes.

So now then why does some gravity exist on the moon, I ask. I then went on to introduce a new term related to gravity and have them think of environments of micro gravity.

I'll finish this lesson later in the curriculum, but for now their wheels are turning....