Iridium

7 Questions
Iridium

Answer the questions in this quiz to find out how much Iridium was found in the rock layer we are investigating.

Please wait...
Questions and Answers
  • 1. 
    Iridium is atomic number:
    • A. 

      73

    • B. 

      28

    • C. 

      77

    • D. 

      94

  • 2. 
    What is the melting point of Iridium?
    • A. 

      200°F

    • B. 

      4436°F

    • C. 

      400°F

    • D. 

      2047°C

  • 3. 
    Iridium is one of the least abundant elements in Earth's crust:
    • A. 

      True

    • B. 

      False

  • 4. 
    Iridium enters the atmosphere in the form of cosmic dust, slowly accreting in the planet's crust
    • A. 

      True

    • B. 

      False

  • 5. 
    Scientists believe Earth's core is rich in Iridium
    • A. 

      True

    • B. 

      False

  • 6. 
    Scientists estimate that the average amount of Iridium in Earth's crust is less than 0.001 parts per million
    • A. 

      True

    • B. 

      False

  • 7. 
    Select the best answers to the question below. Scientists believe that Iridium spikes are caused by:
    • A. 

      Earthquakes

    • B. 

      Volcanoes

    • C. 

      Meteorites

    • D. 

      Gradual accretion of cosmic dust