Over several million years, as new depositional layers are built upon old layers, the weight of the upper layers creates great pressure on the lower layers, causing a transformation from muddy sediment to solid rock.
(new depositional layers; are built; upon old layers) (the weight of the upper layers; creates; great pressure on the lower layers; T:Over several million years) Context(the weight of the upper layers creates,List([82, 120))):(the weight of the upper layers; creates great pressure on the lower layers causing; a transformation from muddy sediment to solid rock)
the weight of the upper layers creates,List([82, 120))
new depositional layers the weight of the upper layers the weight of the upper layers
are built creates creates great pressure on the lower layers causing
upon old layers
great pressure on the lower layers T:Over several million years
a transformation from muddy sediment to solid rock