A Jigsaw Activity.
Divide your class into ten groups.
Each group gets one tree to read about from this site
http://www.touropia.com/famous-trees-in-the-world/
Each group learns 4 interesting facts about its tree.
Re-group the class into new groups containing one pupil from each of the ten previous groups.
The members of the new groups tell each other 4 interesting facts from the tree they learned about in the first group.