Kyle discusses changes to the level of lava in the Halema'uma'u several times. It is a theme of the talk, and he discusses the cause. a. that the pressure in the mantle plumbing beneath Halema'uma'u is changing
b. that eruptions at Pu'u 'O'o are actively changing in time
c. that fissures in Leilani estates are actively changing in time
d. that lava tubes are transporting varying amounts of flow to Kapoho Bay
e. that the pressure and amount of magma in Halema'uma'u magma chamber is changing