This year water levels in the middle and lower reaches of the Yangtze are unusually high.

Hess suggested that the presence of water, probably released from minerals decomposing in the Earth's mantle, might have meant that a high-magnesium magma could have existed at a lower temperature.

7 hr 30 min Even after operators pump water into the primary loop, pressure is still high. The PORV 'backup valve is opened to lower the pressure.