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caldera

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definition: 
A large volcanic crater, typically one formed by a major eruption leading to the collapse of the mouth of the volcano.
sentence: 
The sequential development of multiple summit calderas of shield volcanoes gives clues about how the spatial location of shallow magma chambers evolves with time and how the magma supply into these chambers evolves
difficulty: 
easy
toefl frequency: 
2
toefl classification: