(Answer) What is the Duluth Complex?

[8-13-2022] Microsoft Rewards Bing Homepage Quiz Question: What is the Duluth Complex?

The given options are:

  • A rock formation
  • A shopping center
  • A psychological condition

Correct Answer: A rock formation

Info: The Duluth Complex and the associated North Shore Volcanic Group are rock formations that comprise much of the basement bedrock of the northeastern part of the U.S. state of Minnesota in central North America. The Duluth Complex includes much of Minnesota’s Arrowhead Region north of Lake Superior. The Duluth and Beaver Bay complexes are intrusive rocks formed about 1.1 billion years ago during the Midcontinent Rift. These formations are part of the Superior Upland physiographic region of the United States, which is associated with the Laurentian Upland of the Canadian Shield, the core of the North American Craton. For many years, there has been a dispute over mining the 4 billion tons of copper and nickel ore within the complex just west of Boundary Waters. In recent years, a 20-year ban on mining was imposed to give time to study the potential effects of the mine. That ban was then overturned and is now potentially on the table again. Even more recently, some mining leases have been canceled, which may have sealed the deal on the mine’s future. (Ref)


All three questions from today’s Bing Homepage Quiz are below. You can find their answers by visiting those pages.

  1. Boundary Waters Canoe Area Wilderness is a remote location in which northern state?
  2. Boundary Waters comprises roughly a quarter of which national forest?
  3. What is the Duluth Complex?

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