Niagara Falls: Spectacular Waterfall on the Border
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Questions and Answers

What is the height of the American Falls at Niagara Falls?

  • 150 feet
  • 225 feet
  • 200 feet (correct)
  • 175 feet

    • Which geological period do the rock strata in the Niagara gorge belong to?

  • Cretaceous Period
  • Jurassic Period
  • Devonian Period
  • Silurian Period (correct)

    • What is the length of the curving crest line of the Horseshoe Falls at Niagara Falls?

  • 2,500 feet
  • 2,200 feet (correct)
  • 1,500 feet
  • 2,000 feet

    • What type of rock forms the upper layer in the Niagara gorge at Niagara Falls?

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

    How much does the rock strata in the Niagara gorge dip southward per mile?

    <p>20 feet per mile</p> Signup and view all the answers

    What is the primary factor contributing to the erosion of the Niagara Falls?

    <p>The presence of shale beneath the dolomite layer</p> Signup and view all the answers

    How does the disposition of the rock strata aid in maintaining the vertical nature of the Niagara Falls?

    <p>It creates an overhanging ledge from which water falls vertically</p> Signup and view all the answers

    What is the primary reason for the diversion of water above the Niagara Falls?

    <p>To provide water for hydroelectric power generation</p> Signup and view all the answers

    What safety measures were implemented at the American Falls in 1969?

    <p>Safety measures for the viewing public were implemented</p> Signup and view all the answers

    What is the estimated average rate of recession (upstream movement) of the Horseshoe Falls between 1842 and 1905?

    <p>5.5 feet per year</p> Signup and view all the answers

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