In either case, as soon as rocks are exposed at the Earth's surface, the weathering process begins.
(rocks; are exposed; L:at the Earth's surface) (the weathering process; begins; L:In either case; T:as soon as rocks are exposed at the Earth's surface)
rocks the weathering process
are exposed begins
L:at the Earth's surface
L:In either case T:as soon as rocks are exposed at the Earth's surface