Volcanos Module 5 - Copy - Chapter13:RootsofVolcanoes 1....

This preview shows page 1 - 2 out of 4 pages.

Chapter 13 : Roots of Volcanoes  1. What interior structure of the Earth best explains how earthquake waves propagate through the  Earth's interior? (page 185, para 2 to page 186) Earthquake waves change in character as they travel away from their source, but regardless of the  location of the earthquake, seismographic recordings made at equal distances from the sources are  nearly the same.  This result can be explained by an interior structure of the Earth that is symmetrical  around the center, thus is the Earth’s interior is composed of various materials of different densities,  they must be arranged in layers. 2. What is the average density of the earth and what can one conclude about the interior of the earth  from this fact? (page 186, para 1) The average density of the earth from its size and from the magnitude of the force of gravity at its  surface, it amounts to 5.5 grams per cubic cm, which is twice the density of surface rocks.  This tells us  that the Earth’s interior must e very dense material to bring the average up to 5.5 3. Describe how deep the magma chambers under volcanoes are and whether or not they are the  primary source of the volcanic lava? (page 187, para 1) The magma chambers under volcanoes are shallow and cannot be the deep roots of volcanoes,  however because they occur at depths too shallow for rocks to be melted by the Earth’s heat.  Most  geologists now agree that the decay of radioactive isotopes is the principle heat source. 4. What are the sources of heat for volcanism? (page 187, para 1) The sources of heat for volcanism is uranium, thorium, and potassium, heat form the gravitational  energy of the redistribution of heavy elements toward the center of the Earth.  Most geologists now  agree that the decay of radioactive isotopes is the principle heat source 5. Describe the relative sizes of the Earth's heat of formation against the amount of estimated heat lost 
Image of page 1

Subscribe to view the full document.

Image of page 2
  • Fall '08
  • Campbell-mccrea,M

{[ snackBarMessage ]}

Get FREE access by uploading your study materials

Upload your study materials now and get free access to over 25 million documents.

Upload now for FREE access Or pay now for instant access
Christopher Reinemann
"Before using Course Hero my grade was at 78%. By the end of the semester my grade was at 90%. I could not have done it without all the class material I found."
— Christopher R., University of Rhode Island '15, Course Hero Intern

Ask a question for free

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern