sentences:  During the waning stage of a cinder-cone eruption, the magma has lost most of its gas content.This gas-depleted magma does not fountain but oozes quietly into the crater or beneath the base of the cone as lava.Lava rarely issues from the top (except as a fountain) because the loose, uncemented cinders are too weak to support the pressure exerted by molten rock as it rises toward the surface through the central vent.