What are comets and what are they made of?

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.

What does 2[tex] {2}^{ - 4} \times {2}^{ - 2} [/tex]

Hurry on the map above, arrow 1 points to a region where most people are