2060
argentina was the destruction of the natural grasslands caused by the expansion of the cropping frontiers starting in 1875 .
 destruction, expansion
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: component whole, NA, instrument agency, member collection, cause effect, entity destination, content container, message topic, product producer, entity origin 
Text: {0} 
Answer:
 destruction, expansion