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Current Affairs·Easy

Consider the following statements about types of volcanoes: 1. Shield volcanoes are mostly made up of basalt. 2. The Hawaiian volcanoes are the examples of Shield volcanoes. 3. Composite volcanoes are characterised by eruptions of cooler and more viscous lavas than basalt. Which of the statement given above is/are correct?

Consider the following statements about types of volcanoes:

1. Shield volcanoes are mostly made up of basalt.

2. The Hawaiian volcanoes are the examples of Shield volcanoes.

3. Composite volcanoes are characterised by eruptions of cooler and more viscous lavas than basalt.

Which of the statement given above is/are correct?

Options

  1. a.

    1 only

  2. b.

    2 and 3 only

  3. c.

    1 and 3 only

  4. d.

    1, 2 and 3

    Correct answer

Explanation

  • Shield Volcanoes: Barring the basalt flows, the shield volcanoes are the largest of all the volcanoes on the earth. The Hawaiian volcanoes are the most famous examples. These volcanoes are mostly made up of basalt, a type of lava that is very fluid when erupted. For this reason, these volcanoes are not steep. They become explosive if somehow water gets into the vent, otherwise, they are characterised by low-explosivity. The upcoming lava moves in the form of a fountain and throws out the cone at the top of the vent and develops into cinder cone.
  • Composite Volcanoes: These volcanoes are characterised by eruptions of cooler and more viscous lavas than basalt. These volcanoes often result in explosive eruptions.

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