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20 True/False questions

  1. ________ very dense, solidified, iron-rich alloy.outer core


  2. The ________ of the Earth is enriched in the elements silicon, potassium, sodium, and aluminum compared to the most common types of stony meteorites.crust


  3. The Earth's magnetic field ________.weak electrical currents associated with fluid motions in the outer core


  4. Which one of the following best characterizes the asthenosphere?by analysis of the P-wave and S-wave shadow zones


  5. The fact that ________ is good evidence for a solidified, inner core.P waves are faster in the inner core than in the outer core


  6. The ________ of the Earth does not transmit S waves.outer core


  7. The ________ is the seismic discontinuity that forms the boundary between the crust and mantle.outer core


  8. Which of the following best characterizes how the diameter of Earth's core and the nature of the outer core were discovered?a zone of softened peridotite in the upper mantle


  9. ________ Earth's magnetic field originates in this layer.outer core


  10. ________ transmits P waves but not S waves.outer core


  11. ________ discovered the crust-mantle seismic discontinuity in ________.Andrija Mohorovicic; 1909


  12. _______ are much more abundant in mantle rocks than in crustal rocks.outer core


  13. The P-wave shadow zone is largely the result of a self-generating and self-reversing dynamo in the outer core


  14. ______ is probably closest in chemical composition to the upper mantle.Peridotite


  15. The Earth's magnetic field originates by a self-generating and self-reversing dynamo in the outer core


  16. ______ are closest to the average chemical composition of the oceanic crust.Basalt and gabbro


  17. ________ upper part of the lithosphere includes this layer.outer core


  18. Dense forms of ________ are probably major components of the inner core.crystalline iron and nickel


  19. ________ are thought to be similar in composition to Earth's mantle.Stony meteorites


  20. ________ the top of this layer is marked by the Mohorovicic discontinuity.outer core