How you may ask? Or maybe you aren't because you already knew this... but for me it was like a lightning bolt moment! It is as easy as creating a new Google Drawing and sharing it with people and allowing editing rights... that's it... I really don't know why I didn't think of it before!!!
So this is what the girls were working on yesterday when I found this little gem by peeking over their shoulder... they needed to create a flowchart showing the process of fossilisation and they decided to work together on this.
Here is one group's map while they were all working on it at the same time...