What is mexico's leading producer which is also used to produce much of mexico's power supply

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.

Democratic vs democratic whats the difference? ?

Which of the following graphs represents exponential decay