Cost Comparison of Maritime Shipping vs. Semi-Truck Transportation
Taconite is a rock that is used as a source of iron. Earth science explorers examine a piece up-close and discuss whether they think it is more cost effective to ship it by boat or by truck. They write letters to their state representatives about the shipping industry and its impact on the environment. In this way, they are incorporating an economics lesson and formal writing exercise into their studies on the uses of rock and minerals.