PLEASE HELP ME !!

What do you think could have changed from 306 million years ago to today?

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.

Wich of the following is not likely to appear on a map

Which of the following graphs represents exponential decay