The process used to convert seawater into freshwater is known as  a.  desertification.      b.  salination.      c.  desalination.      d.  deforestation.

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.

Which factors add to the greenhouse effect and are caused by human activities?

On the map below, which of the following rivers is identified by blue? the huang he river the yangtze river the han river the naktong river