Check this site.
http://scign.jpl.nasa.gov/learn/plate1.htm
You could make a ball of homemade clay and cut a wedge out to show the layers. Check some of these websites for homemade clay.
http://www.google.com/search?source=ig&hl=en&rlz=1G1GGLQ_ENUS308&q=homemade+clay&aq=f
4th grader needs to make a model of earths layers showing crust, mantle, and core. Any ideas? Where would I find a picture?
2 answers
type in to google images earth's crust layer and core, then go to the 4th image.