AS GEOLOGY UNIT TEST
KEY IDEA 1: The Earth has a concentrically zoned structure and composition
1. Draw a table to summarise the properties of P, S and L seismic waves.
2. How do the following affect seismic wave velocities?
a) Bulk modulus
b) Shear modulus
c) Density
3. Copy and complete the table:
Rock
Seismic
Thickness
Density
Type/Composition
Velocity
Continental
crust
Oceanic crust
Mantle
Outer core
Inner core
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4. Sketch a travel - time graph showing the seismogram records of three
seismic stations at different distances from an earthquake. Explain how
these travel - time curves can be used to locate an earthquake epicentre
5. Describe and explain with the aid of diagrams the importance of seismology
in defining the Moho
6. Describe and explain with the aid of diagrams the seismic Low Velocity Zone
7. Draw a graph to show the changes in P and S wave velocities and density
with depth
8. Explain how this graph provides evidence for a solid inner and liquid outer
core
9. Draw a diagram to illustrate the paths of seismic waves as they pass through
the Earth
10. Sketch a diagram to illustrate the Earth's magnetic field
11. Describe and explain the origin of the Earth's magnetic field
12. Why is the Earth's magnetic field important evidence for the composition of
the core?
13. What is the difference between stony and iron meteorites and why are they
important in interpreting the Earth's composition?
14. Briefly explain the origin of the layered structure of the Earth
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GEOTREX | Contributor: Ben Church | Establishment: Monmouth Comprehensive School | Date: 11/04/2005
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