Earth's crust swallowed a sea's worth of water and locked it away beneath Pacific seafloor

"...transformed over the eons, absorbing more water as the rocks were ground into clay and became buried."

Grinding rocks into clay sized particles may absorb water, But hardening removes water as clay minerals in shales are diagenetically transformed or metamorphosed into slates.
 
Oct 19, 2023
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Water may be absorbed by rocks as they are crushed into clay-sized particles, but water is removed during the hardening process when clay minerals in shale are genetically changed or metamorphosed into slates.