How Are Volcanic Conduits Formed

question 47

Multiple Choice

How are volcanic conduits formed?

• A)by injecting molten magma up through the volcano to clear a path
• B)by erosion from hot gases that carry hard abrasive rocks and ash upwards
• C)by superheated gases melting a pipe through the older rocks of the volcano
• D)The vent is kept clear by continuous eruption and the walls are formed by deposits.

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