How is soil different from crushed rock?

d. soil is composed of weathered parent material whereas crushed rock is not

Final answer:

The difference between soil and crushed rock is that soil contains humus and supports plant life, while crushed rock is devoid of organic matter. Soil also holds and stores water, which is crucial for sustaining terrestrial ecosystems.

Explanation:

The main difference between soil and crushed rock is that soil contains humus, whereas crushed rock does not. Humus is partly decomposed organic matter, and it contributes to the fertility and structure of the soil. Crushed rock, on the other hand, is simply rock that has been mechanically broken down into smaller pieces and lacks the organic components that define soil. Soil is a heterogeneous mixture that is not only composed of weathered rock particles but also organic matter, water, and air. It forms over time due to the processes of weathering and decomposition, which contribute to its complex structure and ability to support life. Among the options provided, c. soil contains humus whereas crushed rock does not is the correct answer to how soil is different from crushed rock. Soil is vital for plant growth and sustains terrestrial ecosystems due to its ability to hold and store water, promote biodiversity, and moderate the flow of water across landscapes, reducing erosion and flooding.