How did you explain a dip in your GPA during undergrad?

So I'm about to graduate with a B.S. Geography (3.4 GPA) in about 3 weeks and go right to work. I'll be starting a DIY PostBacc as the only BCPM classes I have are 2 math courses that I had to take to graduate (Algebra & Statistics). Looking back at my undergrad career my GPA took a drastic dip my junior year. I had a positive trend my first two years but then I dropped to a 2.9 GPA when averaging out the junior year semesters. Senior year has been my best ending with a 4.0 this semester... How did you explain a dip in your GPA during undergrad?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Nontraditional Students Source Type: forums