Why is it difficult to grow food to feed the people in Himalayan countries like Nepal ?

(Answer fast plz, I need it)

On 25 April 2015, a 7.8 magnitude earthquake struck Nepal with a series of strong aftershocks including one of 7.3 magnitude on 12 May 2015. It was the worst earthquake to hit Nepal in 80 years. It triggered avalanches and landslides and crakes in the mountains and hills. These massive earthquakes and subsequent after-shocks caused 8,699 human deaths, 22,220 injured, 504,775 private and 1,340 government houses fully damaged. Several animals also died with the collapse of the private houses (as of 2 May 2015).

In addition, the seeds, food grains, agricultural tools, implements and machineries were also buried into the debris of the housed which has severely disrupted the food production system and livelihoods in the 40 most affected districts. The United Nations estimated that approximately eight million people had been affected by the earthquakes. Destruction of buildings, roads and other infrastructure will make re-building a long-term challenge.

Explanation:

they were chasing the bread.

the climate of each region is different from one another.