Answer five of the following ten questions. Choose no more than one from each group of two.

• 1) Describe the heat flow of the Earth. Describe the basic principles, modes of flow and internal sources of heat.
• 2) Describe the magnetic field of the Earth. Include some mention of its secular variation and mechanism and location of origin.

• 3) Describe the types and physical properties of the meteorites which strike the Earth's surface. What is their origin? Why do we care?
• 4) Describe the magnetism of rocks. Explain how magnetism is acquired and how geologists make use of it.

• 5) Describe the distribution and types of seismicity that occur on Earth. Mention geometry of motion, relationship to plate boundaries and other processes which accompany it.
• 6) Describe how the various seismic waves (P, S and SURFACE) have been used to recognize the internal zonation of Earth (crust, mantle, core). What are the seismic characteristics and differences between oceans and continents?

• 7) Describe the relationship between the Earth's gravity field and gross crustal structure. Use the Bouguer gravity as the standard of reference.
• 8) How is the Bouguer gravity calculated? What is measured, and what corrections are applied to the measurements?

• 9) Describe the oceanic crust, and include some mention of the changes at the MOHO.
• 10) Describe the continental crust. Include some mention of its composition and zonation.