A rain shadow occurs when

Rain Cloud Occurrence: A rain shadow forms when moist winds head towards a set of mountains and get forced upwards by them. This moist air often comes from the sea or from another large body of water. That's because where there is water, that water can evaporate. The more water evaporates, the more moist the air becomes.

the answer is g1

not only is it colder, it also becomes darker, less salty, and more dense.