In simple terms: Pitch is the angle the wing appears to make with the ground and Angle of Attack (AoA) is the angle the wing makes to the airflow. The following diagrams illustrate pitch and AoA, and how deceptive the pitch of an aircraft can be to an observer on the ground.
Same AoA, different Pitch:
Figure 1
Figure 1 shows that an aircraft flying at the same air speed, it's AoA relative to the air stays approximately the same. However, the pitch appears to change drastically from nose down to nose up. (This picture shows the same result as the PPG in the bottom example only in reverse order)
Same Pitch, different AoA: Click to view figure 2.
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PPG climb, cruise & glide descent: Click to view figure 3.
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