Seventh Grade Science Inside Earth CBA

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Seventh Grade Science Inside Earth CBA
2012-12-20 20:14:35
Seventh Grade Science Inside Earth CBA

Made 12/20/12, CBA 12/21/12
Show Answers:

  1. What are the four major layers of the earth from the surface to the center?
    Crust, Mantle, Outer core, Inner core
  2. Which layer of the Earth is made up of hot rock?
    The mantle
  3. Which part of the core is made up of liquid metal?
    Outer core
  4. Which layer of the Earth is the thickest?
    The mantle
  5. In which layer of the Earth, do sudden shifts cause earthquakes?
  6. What happens to temperature, pressure, and density as you mobe towards the core of the Earth?
  7. What is heat transfer and what are the three types of heat transfer?
    Heat transfer is when heat travels from one area or object to another. Radiation, Convection, Conduction
  8. What is the name for the transfer of heat through open space?
  9. What is the name for the transfer of heat through the direct contact of objects?
  10. What is the name for the transfer of heat through a heated liquid?
  11. What are convection currents?
    The flow that transfers heat through a liquid
  12. Where are convection currents in the mantle?
    In the asthenosphere
  13. What was Alfred Wegener's hypothesis?
    That the continents are slowly pulling away from each other 
  14. What was the name of Wegener's super-continent?
  15. What was the theory of continental drift?
    That the continents are slowly pulling away from each other
  16. Name the evidence Wegener found to support the idea of continental drift. (LCF)
    Landforms, Climate, Fossils.
  17. Describe the evidence Wegener found that supported the idea of continental drift.
    Fossils: Fossils of the glossopteris were found in Africa, Europe, South America, Australia, India, and Antarctica

    Landforms: mountain ranges match up in South America and Africa. Coal fields in Europe lined up with those in NA

    Climate: Coal fields found in Spitzbergen (cold) suggests that it was once closer to the equator. Glacier scrathces in South Africa
  18. Where does molten material rise from the mantle and erupt?
    Mid-ocean ridge
  19. What was Harry Hess's radical idea about the ocean floor?
    That it acted like a conveyor belt. New crust is added, and old crust is subducted
  20. What was the name for Harry Hess's idea?
    Sea-floor spreading
  21. Name the evidence that supported the idea of sea-floor spreading
    Magnetic stripes, drilling samples, and molten material
  22. Describe the evidence that supported the idea of sea-floor spreading.
    Magnetic stripes - Every couple thousand years, the polarity of the earth changes. Magnetic stripes of interchanging polarity were found on the sea floor suggesting that new crust had to be added in order to fit this phenomenon

    Drilling Samples - rocks farther from ridge were older. Closer were newer.

    Molten Material - Pillow-like rocks found in ocean which only form when molten material hardens quickly
  23. What is subduction?
    When one plate dives under another
  24. What causes plates to move?
    Convection currents in Earth's asthenosphere
  25. What is the theory of plate tectonics?
    The theory that the plates are in constant slow motion, driven by convection currents in the Earth's asthenosphere
  26. what are faults?
    Breaks in Earth's crust
  27. What is a transform boundary?
    Where two plates push past eachother in opposite directions
  28. what is a convergent boundary? 
    When two plates are pushed together
  29. What is a divergent boundary?
    When two plates are pulled apart
  30. What is a rift valley?
    a deep valley that forms on a divergent boundary on land
  31. what happens when two oceanic plates meet at a convergent boundary?
    Both are subducted
  32. What happens when two continental plates meet at a convergent boundary?
    Mountain Range
  33. What happens when one continental and one oceanic plate meet at a convergent boundary?
    Oceanic is subducted
  34. Which layer of the earth is most dense?
    The inner core
  35. What is an earthquake?
    The shaking and trembling of Earth's plates
  36. What is the focus of an earthquake?
    The place where the stress releases and rock breaks
  37. What is the epicenter of an earthquake?
    The point directly above the focus on Earth's surface
  38. What are seismic waves?
    vibrations from an earthquake, carries away from focus
  39. Which direction do seismic waves travel?
    Away from the focus
  40. What is an aftershock?
    A smaller earthquke that occurs hours or even months later
  41. Why is the risk of an earthquake so high on the Pacific coast?
    It's on a plate boundary
  42. Why can't geologists predict where an earthquake will occur?
    They don't know when and where the stress will be realeased at the edge of plates
  43. Where do volcano belts form?
    At plate boundaries
  44. Why does California have more earthquakes than MA?
    it's on the boundary of two crustal plates
  45. What is lava called before it reaches earth's surface?
  46. What type of volcano may erupt in the distant future?
    dormant volcano
  47. what type of rocks can be found near volcanoes?
    Igneous rocks
  48. How is heat transfered from deep within the Earth's interior to the crust?
    Convection in the asthenosphere