You probably made rubbings in elementary school, but Kim Beck views rubbings as field recordings. She wants you to take a snapshot of a particular place by making a rubbing of the ground you're standing on.
Assign directly to your students using the code or link above, without having them log in. Simply tell your students to go to
www.pbsstudents.org and enter the Assignment Code, or click on the Assignment URL to share the assignment as a link.