Question

what volcano has steep sides, thick gassy lava, long periods between eruptions and the most violent eruptions? shield cinder-cone composite (strato)

Explanation:

To determine the correct volcano type, we analyze each option:

• Shield volcanoes have gentle slopes, fluid lava, and less violent eruptions.
• Cinder - Cone volcanoes have steep sides but relatively short - lived and less violent eruptions compared to the described type.
• Composite (Strato) volcanoes have steep sides, thick (viscous) gassy lava, long intervals between eruptions, and are known for extremely violent eruptions. This matches the description in the question.

Answer:

Composite (Strato)