 
 <prompt> How many square kilometers of the Alps wey dey cover by glaciers for di year wey dey come two years afta 1874? Given di previous question, write a context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: ```High levels of rain dey make glaciers go down reach permafrost levels for some areas while for other areas wey no get much rain, glaciers dey stay above 3,500 m (11,483 ft) level. The 1,817 square kilometres (702 sq mi) of the Alps wey glaciers cover for 1876 don reduce reach 1,342 km2 (518 sq mi) by 1973, and e don cause river run-off levels to reduce. Forty percent of the glaciation for Austria don disappear since 1850, and 30% of am for Switzerland don disappear.``` 