American Institute of Certified Planners (AICP) Practice Exam

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What is shown in a soil profile?

A cross-section of the earth's soil layers
Aerial images of soil distribution
Historical changes in soil composition
3D models of underground geology

The correct answer is: A cross-section of the earth's soil layers

A soil profile is a detailed representation that provides a cross-section of the earth's soil layers. It typically includes various horizons or layers that differ in color, texture, structure, and composition, reflecting the processes of soil formation and the environmental factors affecting them. Each layer, or horizon, reveals critical information about the soil's characteristics, such as organic matter content, moisture retention, and nutrient availability. By studying soil profiles, professionals can assess soil health, understand the potential for agriculture, evaluate erosion risks, and make informed decisions regarding land use and management. This understanding is essential for effective planning and environmental stewardship. The other choices, while they pertain to soil and geology, do not describe what a soil profile specifically represents.