I loved doing this when I was learning how to read and write! Have the child say the individual letters as they trace them in the salt/cornmeal, and you're addressing all three learning styles: visual, auditory, and kinesthetic.
New Research Shows that Kids With Patient Moms Have Larger Hippocampus (Area of the Brain). But What is a Mom to Do if the Kids Constantly Fight and Whine? Child expert gives ideas on keeping your cool