Assertion: stalagmite | /r/CapableOf | start forming in cavern
Facets:
Source sentences:
text: For their study, Ersek and his colleagues examined a cave formation called a stalagmite that started forming 13,000 years ago in a cavern in what is now Oregon Caves National Monument.
text: For their study, Ersek and his colleagues examined a cave formation called a stalagmite that started forming 13,000 years ago in a cavern in what is now Oregon Caves National Monument.