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Earth Science Summative #4

Quiz by Sara Leigh-Manuell

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15 questions
Show answers
  • Q1
    What is the Geologic Time Scale?
    A record of volcanic eruptions and earthquakes on Earth
    a timeline of dinosaurs
    A record of radioactive fossils
    A record of the life forms and events in Earth's history
    30s
  • Q2
    What is the Mesozoic Era?
    Age of the Reptiles
    Age of the mammals
    Age of single-celled life
    Age of the fish
    30s
  • Q3
    What was the main life forms that existed during the Precambrian Era?
    fish
    multi-celled life
    mammals
    single-celled life
    30s
  • Q4
    How old is the Earth?
    4.6 thousand years
    4.6 billion years
    46 billion years
    4.6 million years
    30s
  • Q5
    Put the Eras in order from oldest to youngest.
    Precambrian-Paleozoic-Mesozoic-Cenozoic
    Paleozoic-Precambrian-Mesozoic-Cenozoic
    Cenozoic-Mesozoic-Paleozoic-Precambrian
    30s
  • Q6
    An asteroid crashed into the Gulf of Mexico at the end of the Mesozoic Era. What did this cause?
    The disappearance of ferns
    The extinction of woolly mammoths
    The extinction of dinosaurs
    The appearance of coral
    30s
  • Q7
    Which Era lasted the LONGEST?
    Cenozoic
    Mesozoic
    Precambrian
    Paleozoic
    30s
  • Q8
    What is the principle of uniformitarianism?
    The present is the key to the past. The processes we see TODAY also happened in the PAST.
    Zero extinctions have taken place throughout history.
    Earth has NOT changed in billions of years.
    Fossils are the only things we need to learn about the past.
    30s
  • Q9
    How can we determine the relative age of a rock?
    The rock layer's texture compared to other layers.
    The rock layer's thickness compared to other layerse
    The rock layer's composition.
    The rock layer's position compared to other layers (lower or higher)
    30s
  • Q10
    The "Law of Superposition" states what?
    The oldest fossils are on the bottom and the youngest are on the top.
    The heavier rocks sink to the bottom and the lighter rocks float
    Each layer of rock has different minerals which change over time.
    30s
  • Q11
    Radiometric Dating refers to _____________age
    absolute
    historic
    total
    relative
    30s
  • Q12
    Why are radioactive substances useful in measuring geologic time?
    They decay at a very unpredictable rate
    They never decay
    The half-lives are short
    They decay at a predictable rate
    30s
  • Q13
    If a large number of species dies out quickly, what is this called?
    a mass extinction
    a massive exodus
    a mass eviction
    30s
  • Q14
    A rock is formed with 1,000 grams of radioactive materials. Today it only contains 250. The half-life is 100 years. How old is the rock?
    500 years old
    100 years old
    250 years old
    200 years old
    30s
  • Q15
    If a rock contains 20 grams of radioactive material and 25% of the material is still radioactive. How many half-lives has the rock gone through?
    0
    1
    3
    2
    30s

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