Question

Q. Consider the following statements with reference to Volcanoes:

Which of the statements given above are correct?

• A.
  1 and 2 only
• B.
  1 and 3 only
• C.
  2 and 3 only
• D.
  1, 2 and 3

Answer 1

The correct option is C

2 and 3 only
Explanation:

Statement 1 is incorrect: The shield volcanoes are the largest of all the volcanoes on the Earth. The composite volcanoes are characterized by outbreaks of cooler and more viscous lavas than basalt. They are constructed from numerous explosive eruptions. The major composite volcano chains are present in the Pacific Rim which is also known as the “Rim of Fire”.

Statement 2 is correct: The shield volcanoes are the largest of all the volcanoes on the Earth. Shield 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 characterized by low- explosivity.

Statement 3 is correct: Caldera is the most explosive of the Earth’s volcanoes. They are usually so explosive that when they erupt they tend to collapse on themselves rather than building any tall structure.