The answer is :
Rock that erodes to expose layering is sedimentary rock.
The explanation:
as the sedimentary rock is type of rock which formed for example mechanically by the erosion of other type of rocks like igneous rock or metamorphic rock which has been transported from its source to another place and redeposit again in river or water as whole.
or may be formed chemically when an certain solution pass through the rock and change its chemical composition.