When two continental plates diverge, there is a valley in between these two plates that forms as the continental crust widens. What geological event is a result of this interaction?

When two continental plates diverge, a valleylike rift develops. This rift is a dropped zone where the plates are pulling apart. As the crust widens and thins, valleys form in and around the area, as do volcanoes, which may become increasingly active.

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?