The term 'What a Volcano Might Do' can be summarized by the crossword solution 'SPEW', which is a four-letter word. Spewing is an action that volcanoes are known to do, as it is the process of ejecting lava, ash, and other materials from the volcano's vent. This is caused by the pressure of gases and steam that build up inside the volcano, and when the pressure becomes too great, it is released in the form of a SPEW.