Which expressions that have rock function?

Hello,

When B is based on A, we can say A is the rock to support B.

for which day / for how long / A that used to do B / the way to follow in order to reach a place ;

through A / by means of A / using A or with A

The price vary all the way from $5 to $50. ------the rock is all the way from $5 to $50.

The country depends heavily on its tourist trade. ----the rock is its tourist trade

the verb of experience / receive / suffer / support ....all of those act as the action of the rock

Ask you for your suggestions.

Thank you for your help.