Which volcanic feature forms when magma cools rapidly in a volcanic pipe?

💡 Explanation

When magma solidifies within the conduit of a volcano, differential erosion exposes the solidified core as a volcanic neck because the surrounding softer material erodes away faster. Therefore a volcanic neck results, rather than a caldera lake, lava tube or fumarole field which involve different formative geological processes.

• Which factor most increases isostatic rebound rates in fjord regions post-glaciation?
• Which geological feature primarily results from mantle upwelling during oceanic plate subduction?
• Which substance accumulates when weathering decreases infiltration rates?
• Which mechanism causes increased flood risk when building impermeable surfaces on an alluvial fan?
• Which slope instability risk increases significantly as permafrost thaws in subarctic regions?
• Which mechanism drives the progressive headward erosion that leads to the formation of a cirque?