home

Soil Groups (According to the WRB)

Can you name all the existing reference soil groups according to the World Reference Base for Soil Resources? The soils most important characteristic is given as a hint.
Quiz by
Knul
Rate:
Last updated: December 9, 2025
You have not attempted this quiz yet.
More quiz info >>
First submittedDecember 9, 2025
Times taken6
Average score53.1%
Report this quizReport
Quiz and answer stats >>
Friends stats >>
5:00
Enter answer here
0
 / 32 guessed
The quiz is paused. You have remaining.
Scoring
You scored / = %
This beats or equals % of test takers also scored 100%
The average score is
Your high score is
Your fastest time is
Keep scrolling down for answers and more stats ...
Hint
Soil Group
Has at least 40cm of organic matter starting within 40cm from the soil surface.
Histosol
Has been formed or heavily modified due to long-term human influences, such as irrigation.
Anthrosol
Contains a significant amount of artifacts in the soil (something that is made or extracted from earth by humans).
Technosol
Contains permafrost within 1m of soil surface.
Cryosol
Continiuous rock starting within 25cm of the soil surface.
Leptosol
Has a high concentration of exchangable sodium.
Solonetz
Clay-rich soil that shows cracks on the surface.
Vertisol
Has a high concentration of soluble salts.
Solonchak
Groundwater-dominated soil, showing reducing and oxidating conditions.
Gleysol
Soil that is dominated by volcanic ash materials.
Andosol
Has a ash-grey E-horizon formed by intense leaching.
Podzol
Has a high concentration of plinthite in the soil.
Plinthosol
Has a textural discontinuity, causing seasonal waterlogging.
Planosol
Water stagnates in the upper soil layer above a slowly permeable layer.
Stagnosol
Deep, well-structured nitic horizon with shiny ped faces and stable aggregates.
Nitisol
Very deeply weathered, iron- and aluminum-rich, low-activity clays.
Ferralsol
Deep, dark humus-rich topsoil with high base saturation and a mollic horizon.
Chernozem
Has a brownish, humus-rich surface horizon typical of steppe climates.
Kastanozem
Humus-rich surface horizon, but more leached and with moderate rainfall
Phaeozem
Has a thick, dark, humus-rich surface layer.
Umbrisol
A soil that has a lot of accumulated silica.
Durisol
A soil that has a lot of accumulated gypsum.
Gypsisol
A soil that has a lot of accumulated carbonates.
Calcisol
Has a distinctive net-like pattern of pale, clay-poor layers within a darker, clay-rich layer.
Retisol
Strongly weathered soil with a clay-rich subsurface horizon and low base saturation
Acrisol
Has an argic horizon with low base saturation and low-activity clays
Lixisol
Has an argic horizon with low base saturation and high-activity clays.
Alisol
Has an argic horizon with high base saturation.
Luvisol
Weakly developed soils showing initial alteration but no major accumulation.
Cambisol
Young soils formed in recent alluvial deposits with stratification.
Fluvisol
Very sandy soils with little profile development.
Arenosol
Has no significant profile development.
Regosol
Save Your Stats
Your Next Quiz
Flags of Europe Quiz
Can you guess every country in Europe based on its flag?
U.S. State Capitals - Sudden Death
Click state capitals. Click nothing but state capitals. Clicking any other city will instantly end the quiz!
Pin US States on a Borderless Map - Sudden Death
Drag the flag onto the correct state. Careful, though! One wrong move and the game ends.
Pin Europe on a Borderless Map - Sudden Death
Drag the flag onto the correct country. Careful, though! One wrong move and the game ends.
Comments
No comments yet
Copyright H Brothers Inc, 2008–2026
Contact Us | Go To Top | View Desktop Site | Site Map