How do scientists know that some mountains were once at the bottom of an ocean?

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.

In a scientific experiment, a is any factor that can be changed or be changed

The ratio of the measures of the three angles in a triangle is 14: 15: 11 find the measures of the angles