Definition

Noun: A roughly circular, bowl-shaped geological depression or hollow found at the summit or on the flanks of a volcano. It is typically formed by volcanic explosions, the collapse of land following the emptying of a magma chamber, or the impact of a volcanic projectile.

Usage

A "volcanic crater" is the specific term for the depression at a volcano's vent. It is the site where eruptive material is expelled. - The main volcanic crater was filled with a steaming acidic lake. - Hikers peered cautiously into the vast volcanic crater. - The new volcanic crater formed during the recent explosive eruption.

Advanced Usage

• Compound Noun: The term is a specific geological compound noun. Its meaning is distinct from a "caldera," which is a much larger depression formed by catastrophic collapse.
• Descriptive Use: Can be used descriptively to emphasize a shape or origin reminiscent of such a formation.
  • The blast left a volcanic crater-like pit in the ground.

Variants and Related Words

• Crater (n): A more general term for any bowl-shaped depression, which can be formed by volcanic activity, meteorite impact, or an explosion.
• Caldera (n): A large, basin-shaped volcanic depression, much larger than a crater, formed by the collapse of the ground after a massive eruption.
• Vent (n): The opening in the Earth's crust through which volcanic material erupts; a crater often surrounds a vent.

Synonyms

• Volcanic vent (when referring to the opening itself within the crater)
• Mouth (of a volcano)

Related Phrases

• Crater lake: A lake that forms within a volcanic crater or caldera.
  • The stunning blue water of the crater lake filled the ancient volcanic crater.

Noun

1. a bowl-shaped geological formation at the top of a volcano