but if a volcano erupts far beneath the surface of the ocean, the tremendous pressure at this depth can prevent the argon from completely escaping.
(a volcano; erupts; T:far beneath the surface of the ocean) (the tremendous pressure at this depth; can prevent; the argon; from completely escaping)
a volcano the tremendous pressure at this depth
erupts can prevent
T:far beneath the surface of the ocean
the argon from completely escaping