Question

Your friend Darius is working on a class project on effigy mounds. He asks you to listen to his main facts about effigy mounds to see if they are all correct before he presents. Which one of his facts is NOT correct?

(1 point)

They are found in the upper Midwest of the United States.


The earliest effigy mounds created in the shape of animals could be up to 3,000 years old.


It is estimated that up to 20,000 effigy mounds were created just in Wisconsin.


The mound builders suddenly stopped creating them due to a sudden volcano eruption

Answer 1

The incorrect fact is: "The mound builders suddenly stopped creating them due to a sudden volcano eruption."

There’s no evidence of a volcanic eruption causing the end of effigy-mound building. The decline appears tied to cultural changes, population movements, and later disruptions (including European contact and disease) over time rather than a single catastrophic volcanic event. The other three statements are generally correct: effigy mounds are concentrated in the upper Midwest, some date back ~2,000–3,000 years, and Wisconsin once had many thousands of mounds (often cited as up to ~20,000 before widespread destruction).