Scientists Dig a Soil Pit
![Scientists digging a soil pit](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/PeopleinPits%20%283%20of%201%29.jpg?itok=DOPFXoFK)
Detailed Description
Digging a soil pit to sample soil organic matter and how it changes over time, Emily Kykker-Snowman (former USGS) and Marjorie Schulz (USGS) at the Mattole soil chronosequence near Petrolia, California.
Sources/Usage
Public Domain.