Share 'Colonization and Exploration Activities'

For my final project in a social studies approaches class, I am to create a thematic unit with two other group members.  We are each in 4th grade classrooms and decided to do our unit on colonization and exploration.  As part of our project, we are to come up with 30 activities that we can put in a learning center for students to work on independently or with partners.  Does anyone have any ideas…