Salt is a resource that we often take for granted. Before refrigeration, people poured salt over meats to preserve them. Soldiers of the Roman Empire received their pay in salt. Even Christopher Columbus was on the hunt for salt when he landed in the New World. Salt is an essential element for life, too. Like water, our bodies need salt. The countries of North America have always had plentiful natural resources. But the exploitation of these resources comes at a cost, and in certain cases, some have wondered if that cost is too high. North American Natural Resources explores all facets of this vital aspect of our economy. Readers will investigate the natural history, human use, technology, environmental impact, and economic significance of the most significant resources on the continent

Mode of access: World Wide Web