How does bare soil type surface effect runoff and why?

Why does physical weathering speed up the processes of chemical weathering? a) physical weathering requires abundant water, as does chemical weathering. b) physical weathering produces fresh surfaces for chemical weathering to attack. c) chemical weathering can occur only on small surfaces, not large ones. d) chemical weathering requires salt, which is provided by salt wedging.

Can someone me with this plz? ! i'm putting 20 points on it!

Why slip off slopes are found on the inside of meanders? why river cliffs are found on the outside of meanders?