Soil — Science definition
A mixture of mineral particles, organic matter, water and air; the air in the pores is as essential as the water.
Where it is taught
- Decomposition, Soil & Nutrient Availability — Ecosystems, Matter & Energy, Life Science & Scientific Inquiry, Grade 7
Questions using soil
Problem 1
Why are spaces in soil relevant?
Answer and explanation
They can hold air and water and affect movement and root conditions, rather than being biologically meaningless empty areas.
Problem 2
Why is “more water always improves soil conditions” unsupported?
Answer and explanation
Water can occupy air spaces and interact with other conditions; the effect depends on the organism and setting.