Assertion: caldera | /r/HasProperty | circular depression
Facets:
Source sentences:
text: A caldera (Portuguese caldeira, meaning "cauldron"), is a circular depression or nearly at the top of some large volcanoes.
text: This caldera, or volcanic crater, is a circular depression that is 12 to 15 miles in diameter with walls that stretch from a few hundred to over 2,000 feet above its floor.