Mass is another name for the celebration of the Eucharist
If you mean for the plates that are the earth's crust they are called 'Tectonic Plates'.
Another name would be a subduction zone.
Communion, Mass, Lord's Supper and probably many others.
Subduction
Communion means reconciliation with one another and with God.So every place can be the place of communion.
Plates Plates Plates
tectonic plates
moving plates
A sentence for communion: Even on their first meeting, the new lovers found themselves in deep communion, gazing into one another's eyes.
along the boundaries of tectonic plates, or another name are fault lines.
Convergent boundary.