Ancient Crater Discovery in Minnesota
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Questions and Answers

What did U of M researchers recently discover in Minnesota?

  • A new mineral deposit
  • A dinosaur fossil
  • An ancient meteor impact crater (correct)
  • An underground water source

    • Where was the discovered crater located?

  • In rural farmland
  • In the Minnesota Geological Survey office
  • In a suburb on the Mississippi River (correct)
  • In Minneapolis city center

    • How does the size of the Minnesota crater compare to the Meteor Crater in Arizona?

  • The comparison is not mentioned
  • The Minnesota crater is the same size
  • The Minnesota crater is smaller
  • The Minnesota crater is larger (correct)

    • What unit of U of M was involved in the discovery of the crater?

    <p>College of Science and Engineering</p> Signup and view all the answers

    How deep is the Minnesota crater located beneath the surface?

    <p>350 feet</p> Signup and view all the answers

    What is the main method used to estimate the diameter of the meteor that hit the Minnesota site?

    <p>Assumptions based on other studied Earth craters</p> Signup and view all the answers

    What is the estimated range of projectile sizes based on crater diameter estimates and surface rock densities?

    <p>150-600 meters</p> Signup and view all the answers

    What is the characteristic evidence for the crater's origin mentioned in the text?

    <p>Defects in shocked quartz</p> Signup and view all the answers

    When is it estimated that the strike happened?

    <p>490 million years ago</p> Signup and view all the answers

    What geological period was drawing to a close at the time of the strike?

    <p>Cambrian period</p> Signup and view all the answers

    What type of rock formed as the Cambrian period was drawing to a close and showed signs of disturbance?

    <p>Jordan Sandstone</p> Signup and view all the answers

    How many sites are already in the official Earth Impact Database, according to the text?

    <p>190</p> Signup and view all the answers

    What is the density of the surface rock mentioned in the text?

    <p>$1.65 tons$ per cubic meter</p> Signup and view all the answers

    What period does late Cambrian life consist of, according to the text?

    <p>Paleozoic era</p> Signup and view all the answers

    What is characteristic of meteor craters, according to the text?

    <p>$1.65 tons$ per cubic meter density</p> Signup and view all the answers

    "Overlying younger rock and glacial deposits" showed what sign in relation to disturbance, according to the text?

    <p>&quot;No sign of such a disturbance&quot;</p> Signup and view all the answers

    What is the characteristic evidence for the crater's origin mentioned in the text?

    <p>Shocked quartz</p> Signup and view all the answers

    What geological period was drawing to a close at the time of the strike?

    <p>Cambrian period</p> Signup and view all the answers

    What period does late Cambrian life consist of, according to the text?

    <p>Simple oceanic organisms</p> Signup and view all the answers

    What type of rock formed as the Cambrian period was drawing to a close and showed signs of disturbance?

    <p>Jordan Sandstone</p> Signup and view all the answers

    What is the estimated range of projectile sizes based on crater diameter estimates and surface rock densities?

    <p>Between 150 and 600 meters</p> Signup and view all the answers

    How does the size of the Minnesota crater compare to the Meteor Crater in Arizona?

    <p>Smaller</p> Signup and view all the answers

    Where was the discovered crater located?

    <p>Minnesota</p> Signup and view all the answers

    How deep is the Minnesota crater located beneath the surface?

    <p>Not mentioned</p> Signup and view all the answers

    How many sites are already in the official Earth Impact Database, according to the text?

    <p>190</p> Signup and view all the answers

    When is it estimated that the strike happened?

    <p>About 490 million years ago</p> Signup and view all the answers

    What is the estimated average depth of the Minnesota crater beneath Inver Grove Heights?

    <p>350 feet</p> Signup and view all the answers

    What unit of the U of M was involved in the discovery of the crater?

    <p>Minnesota Geological Survey (MGS)</p> Signup and view all the answers

    How does the size of the Minnesota crater compare to the Meteor Crater in Arizona?

    <p>It should have an area 11 times the size of Meteor Crater</p> Signup and view all the answers

    What is characteristic of the Minnesota meteor crater, based on the text?

    <p>It is exceptional and was a massive impact</p> Signup and view all the answers

    How many meteor impact sites have been confirmed worldwide?

    <p>190</p> Signup and view all the answers

    What did the U of M researchers recently discover could soon be added to the list of confirmed meteor impact sites?

    <p>An ancient crater in Minnesota</p> Signup and view all the answers

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