Add and Subtract with Hudson River shipping

Rivers aren't just a place for animals to live, they also provide industrial transportation. The class will examine the Hudson River on a map, discuss all the commercial vessels that use the River to transport materials, then complete a worksheet. Multiple web links are provided. Note: It may be wise to also point out how industrialization has adversely affected this, and many other river environments, perhaps pupils can come up with an eco-friendly solution to fix river damage.