Geologic Time and Earth's Formation
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Questions and Answers

What is the Geologic Time Scale used for?

  • Dividing Earth's history into different eras and periods (correct)
  • Explaining the present by examining the past
  • Studying the events that occurred in the past
  • Measuring the age of different rock layers

    • What does an era represent in geologic time?

  • The study of events in the past
  • A major division in geologic time (correct)
  • The explanation of present by examining the past
  • The age of Earth's formation

    • What does absolute time mean in the context of geologic time?

  • Relative time measured in years
  • The age stated in years (correct)
  • Events explained by the present
  • Time period ended with a major extinction

    • What was the significance of the Precambrian era?

    <p>It marked the beginning of Earth's formation</p> Signup and view all the answers

    What type of rock is formed when magma from within the earth cools and hardens?

    <p>Igneous rock</p> Signup and view all the answers

    Which major biological event occurred during the Paleozoic era?

    <p>Existence of the first fish</p> Signup and view all the answers

    What is the thickness of the Earth's outer core?

    <p>2000 km</p> Signup and view all the answers

    What is the composition of the Earth's inner core?

    <p>Solid nickel and iron</p> Signup and view all the answers

    During which era did the North America plate move to the west and north?

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

    What is the primary characteristic that distinguishes metamorphic rocks?

    <p>Undergone transformation by heat and pressure</p> Signup and view all the answers

    What major geological event characterized the Cenozoic era?

    <p>Interior seas dried up from mountain sediment</p> Signup and view all the answers

    What is the primary characteristic of igneous rocks?

    <p>Formed from magma cooling and hardening</p> Signup and view all the answers

    What are rocks?

    <p>Minerals that have lumped together to form a solid mass</p> Signup and view all the answers

    What was the major biological event during the Mesozoic era?

    <p>&quot;Presence of Dinosaurs&quot;</p> Signup and view all the answers

    What does the lithosphere refer to in relation to the Earth?

    <p>Cold and fragile layer on Earth's surface</p> Signup and view all the answers

    What type of rock is formed from sedimentation and compression?

    <p>Metamorphic rock</p> Signup and view all the answers

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