Respuesta :
					                   They are abstract nouns because they don't state directly what they stand for but rather a vague meaning left to individual interpretation. Concrete nouns would be blatantly specific in their meaning with little room for individual interpretation of their meaning.
					                
					                
					             
					                   I believe the words profession, job, trip, and appearance are abstract nouns :)
					                
					                
					              
					                  