020708 Lecture 5 - Lecture 5 February 7 2008 Magnetic field...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 5: February 7, 2008 Magnetic field is determined by processes internal to the planet and their influence is observed everywhere in the globe. 580 degree point- rocks would record the magnetic field when melted and solidify - several phases of melting and solidifying - will record the last time they went below 580 - threshold is important: so we don’t erase the record of the past - mid atlantic/ocean ridge (MOR): symmetry in magnetic polarity Oceanic rocks are recycled in subduction zones. opening of the atlantic - increasing away from the ridge showing that the closer you are, the younger you are and the age - can calculate the rate of continental drift and the rate at which the ridge spread? magnetic field - inclination will change depending on the latitude - equator: parallel to the ground - pole: perpendicular to the ground - if in between: shows the inclination, how far you are form the pole - inclination shows the longitude too - minerals show us the inclination as well as N and S, and where the rock was when it recorded the magnetic field - built in compass in each rock -
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

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