EPS 38-Intro to Earth Science Common segment for sections (S12/513) Summer 201F8

Question

EPS 38-Intro to Earth Science Common segment for sections (S12/513) Summer 201F8 J. N. Bigolski Plate boundaries associated with earthquakes and volcanism are called boundaries. a) Continent-ocean convergent b) Continent-continent convergent c) Divergent d) All of these e) A)& C) only 11Obsidian is a voleanic rock that possesses a(n) texture a) phaneritic b) aphanitic c) porphyritic d) glassy For questions 12-15, refer to the below ilustration . What architecture best describes the volcano in the cartoon? a) Lava dome b) Shield volcano c) Stratavolcano d) Cinder cone 12, -- 13. In addition to the main vent, the side vents calleda are where gases are released without the expulsion of lava. a) fumeroles b) calderas c) cinder cones d) viaducts Page 3 of 10

Explanation / Answer

Answer 10: e) Option A and Option C.

Earthquake and volcanism is seen at subduction zones (at convergent boundaries of continent-ocean) and at rifts where divergent boundaries are located along which two tectonic plates move away from each other causing sea-floor spreading on earth’s oceanic crust.

Note: at Continent-Continent convergent boundaries, there will be formation of an orogeny belt that is formed by the upliftment of the continental crust. This happens since there is virtually no difference in the density of the two plates and hence no plate will be subducted below another. The best example of this are the Himalayas. Even though this boundary can have earthquakes, there will be no volcanic activities since this process does not go deep enough to affect the upper mantle and asthenosphere.

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