A volcanic crater is typically funnel-shaped. This characteristic depression forms at the top of a volcanic cone around the central vent. It is created by the explosive ejection of material and the subsequent settling or collapse of the vent’s walls during and after an eruption. ANSWER: (D) Funnel-shaped
What is the main shape of a crater (volcanic vent)? (A) Conical (B) Vertical (C) Circular (D) Funnel-shaped
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The “funnel” is the path through which magma, gases and ash are channeled during an eruption. While a standard crater is usually less than 1 km in diameter, its shape is defined by the balance between the upward force of the eruption and the downward pull of gravity on the loose volcanic debris (tephra). If the eruption is extremely large and the summit collapses entirely, the funnel-shaped crater is replaced by a much larger, basin-like caldera. The funnel shape is the most common feature of “Cinder Cones” and “Stratovolcanoes” worldwide.