32809
" Gully erosion " occurs when runoff water accumulates and rapidly flows in narrow channels during or immediately after heavy rains or melting snow , removing soil to a considerable depth .
 location: Gully
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Gully 
Answer:
 location: Gully