While political borders often ignore tribal boundaries, differing tribal ghanans were able to use unite under?

Blank is a naturally occurring gas that's found in most soils and rocks and can cause lung cancer

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.

The red square is a famous historical site that is located in