Use of と in these two sentences + のぼる or あがる


I've got these two sentences:

> 屋上にあがると景色がきれいです。
>
> 駅の前に銀行ができると便利になります。

I understand the vocabulary, but I don't get the usage of と.

Also, I don't get why あがる is used instead of のぼる. I think のぼる is used when the
subject actively goes up, and あがる when it goes up without having control of it
himself (kind of like the sun going up), so, I imagine the sentence means
something like the views when getting up onto the roof are really beautiful,
and to get up onto the roof you need to get there on your own means, so... why
あがる?




The と in the first sentence describes a natural sequence. It's like the view
unfolds before you: " **When** you get to the roof, the view is beautiful."

In the 2nd sentence (which is incomplete imo, as you don't know what is going
to be convenient) it shows the order in which the actions are happening: "
**After** the bank in front of the station is built, it will become
convenient."




The と in the first sentence describes a natural sequence. It's like the view
unfolds before you: " **When** you get to the roof, the view is beautiful."

In the 2nd sentence (which is incomplete imo, as you don't know what is going
to be convenient) it shows the order in which the actions are happening: "
**After** the bank in front of the station is built, it will become
convenient."

