Technical presentation about drought and desertification​

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!

In the 1400s, portugal’s economy was based on a. industry b. exports c. finance d. trade