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17 Matching questions

  1. ________ are thought to be similar in composition to Earth's mantle.
  2. ______ are closest to the average chemical composition of the oceanic crust.
  3. The ________ of the Earth is enriched in the elements silicon, potassium, sodium, and aluminum compared to the most common types of stony meteorites.
  4. The ________ is the seismic discontinuity that forms the boundary between the crust and mantle.
  5. ________ very dense, solidified, iron-rich alloy.
  6. ______ is probably closest in chemical composition to the upper mantle.
  7. The P-wave shadow zone is largely the result of ________.
  8. The Earth's magnetic field ________.
  9. Dense forms of ________ are probably major components of the inner core.
  10. Which of the following best characterizes how the diameter of Earth's core and the nature of the outer core were discovered?
  11. ________ discovered the crust-mantle seismic discontinuity in ________.
  12. The Earth's magnetic field originates by ________.
  13. Which one of the following best characterizes the asthenosphere?
  14. ________ the top of this layer is marked by the Mohorovicic discontinuity.
  15. ________ Earth's magnetic field originates in this layer.
  16. The fact that ________ is good evidence for a solidified, inner core.
  17. _______ are much more abundant in mantle rocks than in crustal rocks.
  1. a outer core
  2. b Peridotite
  3. c crust
  4. d Andrija Mohorovicic; 1909
  5. e Magnesium silicates
  6. f inner core
  7. g Basalt and gabbro
  8. h mantle
  9. i Stony meteorites
  10. j is a self-generating and self-reversing dynamo in the outer core
  11. k crystalline iron and nickel
  12. l P waves are faster in the inner core than in the outer core
  13. m Moho
  14. n refraction of P waves crossing the mantle-outer core boundary
  15. o weak electrical currents associated with fluid motions in the outer core
  16. p by analysis of the P-wave and S-wave shadow zones
  17. q a zone of softened peridotite in the upper mantle