4813
The Maurice Ewing Medal is awarded by the American Geophysical Union for " significant original contributions to the understanding of physical , geophysical , and geological processes in the ocean ; to those who advance oceanographic engineering , technology , and instrumentation ; and to those who perform outstanding service to the marine sciences " .
 person: Maurice Ewing; organization: American Geophysical Union
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Maurice Ewing; organization: American Geophysical Union