Everyone can read the text of the Book of Mormon and see it never mentions volcanoes.
In a rational world, everyone would look for an area that fits this description; i.e., a place where people could live for 1,000 years without experiencing or even knowing about an actual volcano, so they never wrote about them.
Because they need volcanoes, the M2C intellectuals "see" them between the lines of the text. They infer that the text describes volcanoes. They have persuaded themselves that the natural events described in 3 Nephi 8 could only have been produced by volcanic activity.
Those who see a different movie recognize that those same identical events have actually occurred in the Mississippi River valleys as the result of massive earthquakes (mainly the New Madrid fault).
Here's a summary from comments on a recent blog: