Physical Geology - Interior of the Earth
Cross Section of the Earth
You may wish to print a copy of the lecture outline (minus the illustrations) and you have two options:
After reading Chapter Seventeen, you should be able to:
- Review the types of seismic waves, and compare and contrast the
properties of these waves.
- Explain how geologists have used seismic waves to explore Earth's
- Portray a cross-section of the Earth.
- Compare and contrast the core, mantle, and crust and the lithosphere and the asthenosphere
In the reference given by the chapter title you will learn how measurements are being made which lead to refinement of the theory of plate tectonics.
Virtual Field Trip
Wegener hypothesized that 200 million years ago India was south of the equator. Many geologists have studied the interaction between India and the Eurasian continent - the Himayala.
TIBET: A VIRTUAL FIELD TRIP --
"Inaccessible Tibet. These words conjure images of remote mountains inhabited by yeti and adepts who sit naked in the
snow, warmed by elevated body temperatures. Tibet has remained a very difficult place to visit and is more fantastic
than imagined. It is a land of immense contrasts: snowy peaks and sandy deserts, barren plateaus and forested
mountains, empty expanses and crowded cities, and a deeply religious people ruled by an avowedly atheistic
Learning about geology from a computer screen is only half as fun as enjoying it in the field!
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Copyright by John C. Butler, July 29, 1995