One of the great things about being an archaeologist is sharing your passion with others. There are a multitude of ethical and creative ways to expose primary and secondary education students to archaeology. Archaeological professional organizations have made educational resource available to school teachers and had various cooperative partnerships with them for a very long time.
For some educational resources, see:
AIA Education and Outreach
ASOR Outreach Education
SAA's Education Page
SAA's Archaeology for the Public
The AIA has just released a video on its website detailing an exciting and creative excavation simulation for students. The video is shown below. Visit the pertinent page on the AIA website for more educational videos, links, and discussion.