Podcast
Play an AI-generated podcast conversation about this lesson
Questions and Answers
What is the main difference between allophane and humus?
What is the main difference between allophane and humus?
- Allophane is crystalline, while humus is amorphous
- Allophane is soluble in water, while humus is insoluble
- Allophane has a variable charge depending on soil acidity, while humus has a high cation exchange capacity (correct)
- Allophane is a product of plant and animal remains, while humus is a mixture of silica and alumina
What contributes to the charge of allophane and other amorphous minerals?
What contributes to the charge of allophane and other amorphous minerals?
- Silica and alumina
- Carbon atoms
- Hydroxyl ions (OH-) (correct)
- Iron oxide
Where are allophane and similar clays commonly found?
Where are allophane and similar clays commonly found?
- In soils forming from volcanic ash (correct)
- In mountainous regions
- In clay-rich riverbeds
- In sandy desert soils
What is the primary composition of humus colloids?
What is the primary composition of humus colloids?
Signup and view all the answers
Which substance is nearly insoluble in water but mostly soluble in dilute alkali solutions?
Which substance is nearly insoluble in water but mostly soluble in dilute alkali solutions?
Signup and view all the answers
