Soil is an effective environmental filter and helps purify water as a three-way filter: physical, chemical and biological. As a physical filter, sand grains have rough edges which help capture wastes and large suspended in water are too big to pass through the small pores in soil.
The Soil Science Society of America has a K-12 Outreach Committee that has been developing materials for kids and teachers since about 2005 and has written a book for Middle School and one for advanced high school environmental science/introductory college soils courses. You can find these materials here, with support from .
Soil! Get the Inside Scoop Get kids excited about the living world of soil! Written for children aged 9-12, this 36-page, full-color book explores how soil is part of our life – the food we eat, the air we breathe, the water we drink, the houses we live in, and more, with support from . The second edition will be published later this year (2025).
What about the story of that aggregate? It is an aggregate from a poorly drained soil: the gray areas represent an anaerobic (reducing) environment, the black is topsoil transported down by a crawdad, and the orange surrounding it is from the aerobic (oxidizing) environment created as oxygen followed the crawdad burrow, with support from .
Updated: 7 February 2025
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