Occurrence of Attributes in Original Text
The text related to the cultural heritage 'Mount Etna' has mentioned 'Caldera' in the following places:
| Occurrence Sentence | Text Source |
|---|---|
| The most recent collapse event at the summit of Etna is thought to have occurred about 2,000xc2xa0years ago, forming what is known as the Piano Caldera. | WIKI |
| This caldera has been almost entirely filled by subsequent lava eruptions but is still visible as a distinct break in the slope of the mountain near the base of the present-day summit cone. | WIKI |