Natural Resources Conservation Service (NRCS): conservation education materials for teachers and students:
NRCS Soil Education page
contains links to many aspects of soil for students and teachers.
NRCS-Soil Biology Primer
The Soil Biology Primer is an introduction to the living component of soil and how it contributes to agricultural productivity, and air and water quality.
From the Ground Down (PDF)
An NRCS publication about Iowa soils
National Soil Science Education web site
contains lots of activities and ideas for students about soil properties, soil and agriculture, and soil and the environment.
Smithsonian National Museum of Natural History
"Dig It!" The Secrets of Soil exhibit and resources
Texas A&M Organic Lifestyles web site
contains lessons on soil basics and aspects of gardening including composting and mulch, flowers, vegetables and pests.
West Texas A&M University "Dr. Dirt" page
Soil scientist Dr. Clay Robinson's web page contains resources for the K-12 classroom about many aspects of soils.
The Field Museum, Chicago "Underground Adventure"
Explores what "life would be like if you lived underground."
Discovery Education "The Dirt on Soil"
provides lessons and activities about what is happening underground.