Her proposal is that heat energy from the volcanoes melted ice in the ground.
(Her proposal; is; that heat energy from the volcanoes melted ice in the ground) Context(Her proposal is,List([0, 15))):(heat energy from the volcanoes; melted; ice in the ground)
Her proposal is,List([0, 15))
Her proposal heat energy from the volcanoes
is melted
that heat energy from the volcanoes melted ice in the ground
ice in the ground