Question

Arrange the following volcano types in their increasing order of explosive activity:
A. Hawaiian,
B. Vulcanian,
C. Strombolian,
D. Vesuvian, E. Plinian.

• A. A, B, C, E, D
• B. A, B, E, C, D
• C. A, C, E, B, D
• D. A, C, B, D, E

Hint:

Increasing explosiveness: Hawaiian \(\rightarrow\) Strombolian \(\rightarrow\) Vulcanian \(\rightarrow\) Vesuvian \(\rightarrow\) Plinian.

Answer 1

The Correct Option is D

Concept:
Volcanic eruptions are classified according to explosiveness, magma viscosity and gas content.

Step 1: Least explosive type.
Hawaiian eruptions are usually quiet and effusive. \[ \text{Least explosive}=A \]

Step 2: Next stages.
Strombolian eruptions are more explosive than Hawaiian eruptions. \[ A<C \] Vulcanian eruptions are more explosive than Strombolian eruptions. \[ C<B \]

Step 3: Highly explosive types.
Vesuvian eruptions are highly explosive, and Plinian eruptions are among the most explosive. \[ B<D<E \]

Step 4: Final sequence. \[ A,C,B,D,E \] \[ \therefore \text{Correct Answer is (D)} \]