25 October 2011
S.I. Session 23 Quiz
This quiz covers material from the lecture on Monday, October 24th.
Part a) Match the term to its definition:
TERMS:
a)Transition Zone b)Air Guns c)Liquids
d)S waves e)Molten f)S Wave Shadow Zone
g)Melting Curve h)Geotherm(al Gradient) i)P Wave Shadow Zone
DEFINITIONS:
1)__This caused the discovery of the liquid outer core.
2)__These materials offer no resistance to shear forces.
3)__These seismic wave sources generate P waves which propagate into the seafloor.
4)__The mineralogy of the earth changes here (660 km beneath the earth’s surface) due to denser crystal structures.
5) __This caused the discovery earth’s core in 1906.
6)__When the geotherm lies to the right of the melting curve the material is _____.
7)__ the rate of increasing temperature with respect to increasing depth in the Earth's interior.
8)__The statistics plotted on this are based on laboratory measurements on expected mantle materials.
9)__These vanish in the outer core.
Part b) Use the simple labeling scheme to classify these waves:
1) A core reflected S wave:
2) A core refracted P wave:
3) An inner Core P wave:
Part c) True or False:
Mark T (true) or F (false) in the blank provided:
1)__The P wave shadow zone is larger than the S wave shadow zone.
2)__The mineralogy changes in the transition zone are due to immense pressures.
3)__Seismic wavepaths curve up towards the surface as rocks become denser with increasing depth.
4)__The velocity of a wave depends on the type of material through which it passes.
5)__The P wave shadow zone is caused by waves refracting into the earth’s core.
6)__P wave velocities and densities decrease with depth.
7)__S waves can only propagate in fluids.
8)__The seismic waves from earthquakes have been used to study the earth’s interior.
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