Civil Services Prep

Prelims MCQ · Geography

Consider the following statements:

  1. Shield volcanoes are composed mainly of fluid basaltic lava and usually have low-explosivity eruptions.
  2. Composite volcanoes erupt cooler and more viscous lava than basalt and commonly accumulate layers of lava, ash and pyroclastic material.
  3. Calderas characteristically build tall volcanic structures rather than collapsing after explosive eruptions.
  4. The system of mid-ocean ridges extends for more than 70,000 km, with frequent eruptions occurring along its central portions.

Which of the statements given above are correct?

  1. 1, 2 and 4 only
  2. 1 and 3 only
  3. 2, 3 and 4 only
  4. 1 and 4 only
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