Answer:
Climate change
Explanation:
A group of change in climate system that is persistent for up to 30 years is called Climate change
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When water evaporates from its liquid form it changes into a gas. However, when water evaporates and becomes a gas it is no longer water (the name given to its liquid form) but is now considered water vapor. Water vapor is invisible and is lighter than air and for it to turn into water again must go through a process of condensation.
The area with the desert-like conditions is called a rain shadow. The mountains block the passage of rain-carrying clouds, which are carried upwards by the wind. The moisture condenses and precipitates before it can cross the mountaintops, so they can't deliver rain to the area on the leeward side of the mountains.