Which natural resource is Michigan notably rich in?

Michigan is notably rich in copper, particularly in the Upper Peninsula, which has been a significant site for copper mining since the 19th century. The region's geology includes substantial copper deposits, particularly in areas like the Keweenaw Peninsula, making it one of the largest copper-producing areas in the United States during its peak.

Copper mining thrived in Michigan due to the high grade of the ore found there, and historic mining operations have left a lasting impact on the geography and economy of the region. Today, copper is still recognized as a valuable mineral resource that contributes to Michigan's identity and historical significance, highlighting the importance of this natural resource in the state's geological and economic landscape.

While the other resources listed, such as coal, oil, and iron, are present in Michigan, none have the same level of historical significance or economic impact as copper in the state.