Volcanic eruptions, sediment deposition, tectonic uplift, and other processes serve to build up land forms, and weathering and erosion wear them down.
(weathering and erosion; wear down; them) (Volcanic eruptions; serve; to build up land forms) Context(Volcanic eruptions serve,List([0, 83))):(Volcanic eruptions; serve to build up; land forms)
Volcanic eruptions serve,List([0, 83))
weathering and erosion Volcanic eruptions Volcanic eruptions
wear down serve serve to build up
them
to build up land forms
land forms