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Which layer of Earth transmits P earthquake waves but not S earthquake waves?
Which one of the following best characterizes the asthenosphere?
A zone of softened peridotite in the upper mantle
Which layer of Earth is very dense and solid and consists most likely of an iron-rich alloy?
Which layer of Earth has the smallest volume?
Who discovered the crust-mantle seismic discontinuity? In what year?
Andrija Mohorovičić, 1909
Which of the following are probably major components of Earth's inner core?
Crystalline iron and nickel
Which one of the following statements concerning Earth's magnetic field is true?
At high latitudes, the force lines intersect Earth's surface at steep angles.
What causes Earth's magnetic field?
Weak electrical currents associated with fluid motions of molten iron in the outer core causes Earth's magnetic field.
What causes the P-wave shadow zone?
Refraction of P waves crossing the mantle-outer core boundary
What is the upper layer of the lithosphere called?
Which of the following is the result of convection within the mantle?
Warm rock rises as narrow pipe-like plumes.
hat is the best evidence of Earth having a solidified inner core?
P waves travel faster in the inner core than in the outer core.
Which rock type listed below is probably closest in chemical composition to the upper mantle?
Which layer of Earth does not transmit S waves?
Which of the following includes the zone called the "asthenosphere" (the "weak sphere")?
Which of the following rocks are closest to the average chemical composition of the oceanic crust?
Basalt and gabbro
Which of the following best characterizes how the diameter of Earth's core and the nature of the outer core were discovered?
Through analysis of the P-wave and S-wave shadow zones
Which of the following describes Earth's magnetic field?
Earth's magnetic field is a self-generating and self-reversing dynamo in the outer core.
Where does Earth's magnetic field originate?
What structure in Earth is thought to be caused by a change in the mineral structure of olivine?
The 660-km-depth discontinuity or transition zone
Which of Earth's layers is marked at its top by the Mohorovičić discontinuity?
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