Task: Sentence Expansion
Input (English): The effect of mountain chains on winds is to carry warm air belonging to the lower region into an upper zone , where it expands and loses heat , and drops snow or rain .
Output (English): The effect of mountain chains on prevailing winds is to carry warm air belonging to the lower region into an upper zone , where it expands in volume at the cost of a proportionate loss of temperature , often accompanied by precipitation in the form of snow or rain .