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Earth science 11.3
 

Earth science 11.3

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    Earth science 11.3 Earth science 11.3 Presentation Transcript

    • 11.3 Mountain Formation
    • Accretionary wedge
      • 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
    • accretion
      • Process that occurs when crustal fragments collide with and stay connected to a continental plate.
    • terrane
      • A crustal block bounded by faults, whose geologic history is distinct from the histories of adjoining crustal blocks
    • Isostacy
      • The concept that earth’s crust is floating in gravitational balance upon the material of the mantle
    • Isostatic adjustment
      • Process of establishing a new level of gravitational equilibrium
    • Key Concept
      • 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.
    • Key Concept
      • Ocean- ocean convergence mainly produces volcanic mountains.
    • Key Concept
      • The types of mountains formed by ocean-p continental convergence are volcanic mountains and folded mountains.
    • Key Concept
      • At a convergent boundary between two plates carrying continental crust, a collision between the continental fragments will result and form folded mountains.
    • Key concept
      • The mountains that form along ocean ridges at divergent plate boundaries are fault- block type mountains.
    • Key concept
      • Because of isostasy, deformed and thickened crust will undergo regional uplift both during mountain building and for a long period afterward.