Chapter 2-1 - 2 Click to edit Master title and Plate...

Info icon This preview shows pages 1–19. Sign up to view the full content.

View Full Document Right Arrow Icon
Click to edit Master title style 2 Plate Tectonics and Physical Hazards
Image of page 1

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

View Full Document Right Arrow Icon
The Big Picture Pieces of Earth’s surface Move around Grind sideways Collide Sink into Earth’s hot interior Collisions create mountain ranges, cause tsunami Less directly, mountain ranges affect weather and climate
Image of page 2
Fig. 2-1, p. 15
Image of page 3

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

View Full Document Right Arrow Icon
Fig. CO-2, p. 14
Image of page 4
Earth Structure Layers of Earth based on rock composition: core, mantle, crust Layers of Earth based on rock rigidity or strength: Lithosphere is stiff, rigid outer rind of Earth, which makes up plates from 60 km (oceanic) to 200 km (continental) thick, including crust and denser underlying mantle Asthenosphere is inner, hotter, more easily deformed layer
Image of page 5

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

View Full Document Right Arrow Icon
Fig. 2-2, p. 15
Image of page 6
Earth Structure Continental crust Silica-rich Low density 2.7 g/cm 3 30-50 km thick Stands higher than denser oceanic crust Oceanic crust Iron-, magnesium-rich, silica-poor Higher density 3.0 g/cm 3 7 km thick Floats lower than continental crust, on top of denser mantle
Image of page 7

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

View Full Document Right Arrow Icon
Earth Structure Elevation difference between continental and oceanic crust explained by isostacy Floating solid object displaces liquid of same mass Crust (continental or oceanic) floats atop mantle (denser mantle slowly flows away to accommodate crust)
Image of page 8
Height of a Floating Mass Height to which floating block rises above fluid is proportional to the density of the floating block relative to the density of the fluid Fig. 2-BTN1, p. 16
Image of page 9

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

View Full Document Right Arrow Icon
Earth Structure Boundary between crust and mantle identified as density difference: Mohorovicic Discontinuity (Moho) Boundary between lithosphere and asthenosphere has been identified as zone of lower velocity for seismic (earthquake) waves traveling through mantle: low-velocity zone (LVZ)
Image of page 10
Plate Movement Lithosphere is broken into about 12 large plates , most of which are combination of continental and oceanic areas, moving up to 11 cm/year
Image of page 11

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

View Full Document Right Arrow Icon
Fig. 2-3, p. 17
Image of page 12
Plate Movement Plates move away from each other at divergent boundaries – usually mid-oceanic ridges Plates move toward each other at convergent boundaries Subduction zone : one plate dives under other, into mantle Continent-continent collision : low density of continents prevents subduction, crumple up into each other instead Plates slide past each other at transform boundaries
Image of page 13

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

View Full Document Right Arrow Icon
Fig. 2-4, p. 18
Image of page 14
Fig. 2-5, p. 19
Image of page 15

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

View Full Document Right Arrow Icon
Stepped Art Asthenosphere Inner core Mantle Outer core Upwelling Hot Cold Continental lithosphere Trench Midoceanic ridge Ocean Subduction zone Oceanic lithosphere Fig. 2-5, p. 19
Image of page 16
Fig. 2-6, p. 19
Image of page 17

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

View Full Document Right Arrow Icon
Plate Movement
Image of page 18
Image of page 19
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