How were the mountains in Pennsylvania formed?

Explanation:

The varied geology of Pennsylvania is representative of deep geologic times and events -- when geologic plates collided and formed mountains, when the land surface was under water or ice, and even during relatively quiet times.

places of higher salinity. there are parts of the ocean where hardly any rain falls but warm dry winds cause lots of evaporation. this evaporation removes water – when water vapour rises into the atmosphere, it leaves the salt behind, so the salinity of the seawater increases. this causes the seawater to become denser.