Geosci lesson 2 .docx - UNIT 2 Textbook 2.1 Plate Tectonics...

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

UNIT 2 Textbook 2.1: Plate Tectonics 1, Death Valley Death Valley o Death Valley National Park of California and adjacent Nevada sits as deep as 282 feet below sea level near Badwater, the lowest land in the western hemisphere. o Death Valley created by pull apart faults dropping down along faults as the region is pulled apart o lava also leaks into Death Valley along its faults, with eruptions within the last 200 to 300 years. Mid oceanic Ridge o The ridge runs right up through the middle of the Atlantic (coming to the surface in Iceland). o Because the ridge is in the middle of the Atlantic, and the middle of the Gulf of Mexico, and the middles of some other ocean basins, it is often called a mid- oceanic ridge o It is made of rocks that are young—they hardened as lava cooled recently—near the ridge, with older rocks—they hardened as lava cooled a long time ago—as you move away in either direction. o It is a baseball-seam volcano through all the world’s oceans that is making seafloor and splitting and spreading continents and ocean basins. Heat inside the earth o All rocks contain radioactive elements (mostly uranium, thorium, and radioactive potassium, but with some others). o Radioactive decay of these makes heat in the Earth, much as radioactivity produces heat in nuclear power plants. Most of the Earth’s heat comes from this radioactive decay, although some heat is left over from when the Earth formed, or is being released as the core freezes, or the core, mantle, and crust continue to separate and things sink and give up heat from friction.
Image of page 1

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

Image of page 2
This is the end of the preview. Sign up to access the rest of the document.
  • Fall '16

{[ 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