It notes that volcanoes are often accompanied by earthquakes, and that both often occur together along fault lines. The main point of the article is to warn us of their potential danger. And they shall be visited with thunderings, and lightnings, and earthquakes, and all manner of destructions, for the fire of the anger of the Lord shall be kindled against them, and they shall be as stubble, and the day that cometh shall consume them, saith the Lord of Hosts. And when that day shall come they shall be visited of the Lord of Hosts, with thunder and with earthquake, and with a great noise, and with storm, and with tempest, and with the flame of devouring fire. Moreover, the scriptures often tell us that when the Savior returns, the mountains will flow down at his presence.
Molten mountains are certainly consistent with lava flowing.
Some of our latter-day Church leaders have specifically mentioned the threat of volcanoes. Woes shall rest upon men as the Lord by the voice of the forces of nature calls upon them to repent and be as he would have them be. 2 Several authors have noted that the destruction at the Savior's death recorded in the Book of Mormon certainly sounds like a description of volcanic activity. A moist ash often accompanies volcanoes. The phrase 'dispersed from off the face of the land' suggests a breaking up and scattering, such as would characterize the eventual dispersion of an ash cloud.