Invite a geologist, archaeologist or paleontologist from a local college or state geological survey office to talk to the class about what the ice ages were like, why they happened, and if another one could happen.
Read some books about the last ice age and try to find some geological evidence of an ice age in your local landscape.
Copy a picture of a mammoth onto a sheet of overhead transparency plastic.
Then project this image onto a wall so that the mammoth appears 3m (10') tall.
Trace the image onto strips of butcher paper.
When the drawing is complete, cut out the animal's outline and assemble the strips into a complete life-;size representation.
Use modeling clay to construct an assortment of tooth shapes.
These shapes should include distinct teeth that are adapted for grinding, cutting, and tearing.
How can these teeth be used to explain the spread of mastodons, but not mammoths, into South America?