as for as i am concerned, studying on field is much better than studying in classroom. studying outside classroom is an active method to take hold of knowledge, by this  way ,can we comprehensive the knowledge clearly .but ,classroom studying is too abstract to understand. for instance,to understand a chemical experiment ,take it to practice is a nice method. 
      by field studying ,not only can we comprehensive it ,but make friends during this process.for example,going summer camp bring new chance to make friends.while learning history,gong to library can give us a broaden  horizon .but, classroom studying cannot  bring us so many stuff to  consult.
       as every coin has two sides, class  learning also has  some advantages, by teaching face to face ,students can study more quickly. but,compare with its advantage,disadvantages  has a larger  influence.so, support the field trip education.