In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

The loss of pressure makes bubbles by lowering the boiling point of the lava ( like the bubble-creation when a carbonated drink is opened ) .
The depressurization creates bubbles by lowering the solubility of gases ( including water and CO ) that are dissolved in the lava , causing the gases to rapidly exsolve ( like the bubbles of CO that appear when a carbonated drink is opened ) .