Erosion The Niagara Escarpment formed for two reasons: first, a layer of hard rock lies on top of layers of softer rock.
(The Niagara Escarpment; formed; for two reasons) (a layer of hard rock; lies; on top of layers of softer rock; T:first)
The Niagara Escarpment a layer of hard rock
formed lies
for two reasons
on top of layers of softer rock T:first