He pointed out all of this in miniature. There were receding snowbanks depositing sediment, new water channels being formed where there was no grass or other root vegetation to hold it back, snow in the shade which melted far more slowly and unevenly producing entirely different run-off patterns and even miniature canyons being formed where there were conditions of rapid melt and run-off into narrow channels.
Just about all of us came back to the classroom with a better understanding of how our land features formed than we would have learned in a semester of lectures and book reading.
Bttt.
That's great. You learned at a young age that many things can be understood by observing and thinking. That's a lesson that sticks with you your whole life. Good teacher.