Explanation by: Mr. Dubey

When magma from beneath the Earth's crust reaches the surface, it emerges through an opening called a vent. This vent is the main outlet through which lava, ash, and gases are expelled during a volcanic eruption.

  • Pipe: A conduit that carries magma from the magma chamber to the vent.
  • Cone: The mountain-like structure formed from successive eruptions.
  • Crater: The bowl-shaped depression at the top of the volcano.
  • Vent: The actual opening on the Earth’s surface where magma is released.

Therefore, the correct answer is (C) Vent.

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