Centuries of chemical erosion slowly formed these caverns inside Humpback Mountain when carbon dioxide combined with water to make carbonic acid and began dissolving calcium carbonate in the rock along its course.
(Centuries of chemical erosion; slowly formed; these caverns inside Humpback Mountain) (carbon dioxide; combined; with water) (carbon dioxide combined with water; to make; carbonic acid) (Centuries of chemical erosion; began; dissolving calcium carbonate in the rock along its course)
Centuries of chemical erosion carbon dioxide carbon dioxide combined with water Centuries of chemical erosion
slowly formed combined to make began
these caverns inside Humpback Mountain
with water
carbonic acid
dissolving calcium carbonate in the rock along its course