[blam]

"The crustal plates around the region are kind of small compared to continental plates, almost as if one or two continental plates were broken by an impact."

Do you think continental plates are broken by (some) impacts?

[RightWhale]

Do you think continental plates are broken by (some) impacts?

Another question is whether they have any tensile strength at all. They might resemble the coating of slag on top of molten metal, a froth initially, a scum, and when they gain some thickness, they might be coherent enough to be fragmented.