Which of the following is not included in the three classes of volcanoes that are classified based on the frequency of their eruptions?
Volcanoes are classified into three types based on frequency: Active, Dormant and Extinct. A Composite volcano (or stratovolcano) is a classification based on structure and shape, not frequency. It refers to a volcano built up by many layers of hardened lava, tephra, pumice and volcanic ash. ANSWER: (B) Composite volcano
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Geologists classify volcanoes in two main ways: by their activity and by their physical form. Based on the “frequency of eruption,” we only use Active, Dormant and Extinct. Composite volcanoes, along with Shield volcanoes and Cinder cones, describe the morphology—how the volcano looks and what it is made of. Composite volcanoes are known for their tall, symmetrical peaks and explosive eruptions, but they can be active, dormant or extinct. Therefore, “Composite” does not belong in a list that defines how often a volcano erupts.