Main
DIG IT!
Arctic
Atmosphere
El Niño
Smithsonian National Museum of Natural History
Overview
Exhibition
Explorers
Media Library
For Educators
Learn More
Dig It!
What is
Soil?
Chip Off the
Old Block
Soil Forming
Factors
Matters of
Life and Death
Underneath
It All
Wise
Choices
A World
of Soils
<<
1
What is Soil?
2
The Skin of the Earth
3
Soil Ingredients
4
Soil Recipes
5
CLORPT for Short
>>
CLORPT for Short
Soil scientists nickname the soil-forming factors CLORPT: