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Earth science 11.3
Earth science 11.3
Earth science 11.3
Earth science 11.3
Earth science 11.3
Earth science 11.3
Earth science 11.3
Earth science 11.3
Earth science 11.3
Earth science 11.3
Earth science 11.3
Earth science 11.3
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Earth science 11.3

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  • 1. 11.3 Mountain Formation
  • 2. Accretionary wedge <ul><li>A large wedge-shaped mass of sediment that accumulates in subduction zones; Here sediment is scraped from the subducting oceanic plate and accreted to the overriding crustal block </li></ul>
  • 3. accretion <ul><li>Process that occurs when crustal fragments collide with and stay connected to a continental plate. </li></ul>
  • 4. terrane <ul><li>A crustal block bounded by faults, whose geologic history is distinct from the histories of adjoining crustal blocks </li></ul>
  • 5. Isostacy <ul><li>The concept that earth’s crust is floating in gravitational balance upon the material of the mantle </li></ul>
  • 6. Isostatic adjustment <ul><li>Process of establishing a new level of gravitational equilibrium </li></ul>
  • 7. Key Concept <ul><li>Most mountain building occurs at convergent plate boundaries. Colliding plates provide the compressional forces that fold, fault, and metamorphose the thick layers of sediments deposited at the edges of landmasses. </li></ul>
  • 8. Key Concept <ul><li>Ocean- ocean convergence mainly produces volcanic mountains. </li></ul>
  • 9. Key Concept <ul><li>The types of mountains formed by ocean-p continental convergence are volcanic mountains and folded mountains. </li></ul>
  • 10. Key Concept <ul><li>At a convergent boundary between two plates carrying continental crust, a collision between the continental fragments will result and form folded mountains. </li></ul>
  • 11. Key concept <ul><li>The mountains that form along ocean ridges at divergent plate boundaries are fault- block type mountains. </li></ul>
  • 12. Key concept <ul><li>Because of isostasy, deformed and thickened crust will undergo regional uplift both during mountain building and for a long period afterward. </li></ul>

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