Plate Tectonics and Earth's Structure
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Questions and Answers

What is plate tectonics?

  • The theory that the earth's mantle is solid and immovable
  • The theory that plates in the earth's core slide around randomly
  • The theory that the surface of the earth is flat like a plate
  • The theory that the earth's surface is broken into plates that move on the asthenosphere (correct)

    • How thick can continental plates be according to the text?

  • 50 km
  • 200 km
  • 150 km (correct)
  • 100 km

    • What is the asthenosphere?

  • The zone where earthquakes occur
  • The lower crust of the earth
  • The upper part of the mantle where plates ride (correct)
  • The earth's core made of solid iron and nickel

    • Who proposed the theory of plate tectonics?

    <p>Geologists studying the earth (B)</p> Signup and view all the answers

    How do plates move according to plate tectonics?

    <p>They slide along on the asthenosphere (C)</p> Signup and view all the answers

    What do geologists now have thanks to plate tectonics?

    <p>An understanding of drifting continents (D)</p> Signup and view all the answers

    What is one result of plate tectonics according to the text?

    <p>Formation of new oceanic plates (A)</p> Signup and view all the answers

    What is the main theory behind plate movement?

    <p>Convection currents in the mantle (A)</p> Signup and view all the answers

    What are the main components of the Earth's core?

    <p>Iron and nickel (B)</p> Signup and view all the answers

    How does heat from the core cause plate movement?

    <p>By creating convection currents in the mantle (C)</p> Signup and view all the answers

    What is represented by the hard outer layer of the earth in the apple analogy?

    <p>The crust or lithosphere (A)</p> Signup and view all the answers

    What happens when oceanic crust is forced under another plate?

    <p>It is pushed back into the mantle (B)</p> Signup and view all the answers

    How are continental boundaries different from plate boundaries?

    <p>Continental boundaries are static while plate boundaries are dynamic (D)</p> Signup and view all the answers

    What is the source of heat that drives the process of plate movement?

    <p>Radioactive decay of uranium and other elements (D)</p> Signup and view all the answers

    What is the theory that explains the large-scale changes on Earth's surface?

    <p>Plate Tectonics theory (D)</p> Signup and view all the answers

    What is the thickness range of oceanic plates according to the text?

    <p>5-10 km thick (A)</p> Signup and view all the answers

    In plate tectonics, what is the name of the softer layer of Earth that the plates ride along on?

    <p>Asthenosphere (C)</p> Signup and view all the answers

    How thick can continental plates be according to the text?

    <p>Up to 150 km thick (B)</p> Signup and view all the answers

    What did plate tectonics provide geologists with?

    <p>An all-encompassing theory to tie their observations and data together (B)</p> Signup and view all the answers

    Which part of the Earth's structure is represented by the asthenosphere in plate tectonics?

    <p>Mantle (C)</p> Signup and view all the answers

    What was the mystery solved by plate tectonics according to the text?

    <p>The drifting continents mystery (C)</p> Signup and view all the answers

    What is the main cause of plate movement according to the text?

    <p>Heat generated by the radioactive decay of elements in the core (C)</p> Signup and view all the answers

    In the apple analogy used in the text, what does the fruit of the apple represent?

    <p>The mantle (D)</p> Signup and view all the answers

    What geological feature is used to identify converging boundaries in plate tectonics?

    <p>Deep ocean trenches (C)</p> Signup and view all the answers

    How do convection currents in the mantle contribute to plate movement?

    <p>By providing a mechanism for moving the plates indirectly (A)</p> Signup and view all the answers

    What effect does ridge push have on plate movement?

    <p>Pushes plates along and flattens them out (D)</p> Signup and view all the answers

    What happens when oceanic crust is forced under another plate?

    <p>It slides back into the mantle (C)</p> Signup and view all the answers

    How is plate movement similar to the action of a convection current in a pot of boiling water?

    <p>Hot rock flows upward and cool rock flows downward (D)</p> Signup and view all the answers

    What role does gravity play in assisting plate movement according to the text?

    <p>'Gravity assists in pulling plates along and giving them an additional force to keep moving' (B)</p> Signup and view all the answers

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