Interaction with the atmosphere
Activity of microorganisms
Release of acidic chemicals from plants
Decay of organic materials
O – the organic rich layer is otherwise unaltered rock.
C – it is the bottom of the profile, immediately above unaltered rock.
E – fine particles are unaltered pieces of rock.
B – it is clay rich, and just above the layer that includes small pieces of rock.
"cutting" down through the surface on which it flows
Transport and deposition of sediment
All of these
Number and dates
Months and inches of snowfall
Snow and months
Inches of snowfall and months
Star is born