1. Thick telephone book (Yellow Pages).
2. Blue piece of construction paper.
3. 2 tables of the same height placed side-by-side with a small gap between.
Place telephone book on one table and paper on other. The spine of the telephone book should be facing the paper. Slowly move both towards each other. The thinner paper should slide underneath or “subduct” beneath the telephone book in the same manner as ocean plate subducts beneath continental plate.
Figure 1 Side view of demonstration showing subduction of paper, representing ocean plate, beneath telephone book, which represents continental plate.