Google Maps offer some excellent possibilities for individual and collaborative online learning activities.

http://www.freetech4teachers.com/2011/07/google-maps-for-educators-how-to-guide.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+freetech4teachers%2FcGEY+%28Free+Technology+for+Teachers%29

More advanced projects build on the basic functionality of Google Maps and Google Earth.

https://sites.google.com/site/mapmakerpedia/collaborative-mapping-crowdsourcing

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Relief overlay for Google Maps Shaded Earth