Which of the following is considered a secondary effect of volcanic eruption?

Question

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A lahar is a secondary effect of volcanic eruption, which is a type of mudflow or debris flow that occurs when volcanic ash and debris mix with water, often from heavy rainfall or melting snow and ice. Lahars can be extremely destructive and can travel long distances from the volcano, posing a threat to communities downstream. The other options listed (pyroclastic flow, pyroclastic surge, poisonous gas, and ash fall) are all primary effects of volcanic eruption.

Which of the Following Is Considered a Secondary Effect of Volcanic