Poke a small hole in one of the short sides of the shoebox with a pencil.
Mold three small, round balls from clay. Place a Popsicle stick into each of the clay balls. The clay balls represent the trees; stand the trees up inside the shoebox.
Spread a layer of sand over the bottom of the shoebox. Spread an equal layer of soil on the bottom of the shoebox. Mark the level of the sand soil with the pencil on the Popsicle sticks in the clay.
Place several small rocks on top of the sand and soil in the bottom of the shoebox. Tape the cover back on the shoebox.
Give each student a straw and ask them to place the straws into the hole at the end of the shoebox. Ask each student to blow into the shoebox one time to create the wind for the erosion.
Remove the lid from the shoebox after each of the students takes a turn. Mark the new level of the sand and soil on the trees. Observe the location of the rocks and discuss the effects of the wind on the contents of the box.