That would be a GREAT use of Google Earth. What a way to make the lesson more exciting!
Yes, there is. To export a single placemark, right-click on it and choose "Save As" and then give it a name. It will save with a ".kmz" extention.Is there a way of exporting lists of Placemarks ?
To export a list of placemarks, create a "folder" in your [Places] area (where all of the placemarks live), then drag some of your placemarks into that folder. Then you can simply right-click on the folder and choose "Save As" and it will save the entire folder, which includes all of the placemarks in it, to a .kmz file.
Good luck with your idea - it sounds neat!