Fill in the blanks on the diagram below with the names of the soil "layers" that are labeled. 
Definitions:
Variables
Elements, factors, or conditions that can change or vary, often considered in research or experiments to observe effects on outcomes.
Structure
The arrangement of and relations between the parts or elements of something complex, forming a coherent whole.
Mental Abilities
The capacity to perform cognitive tasks, understand complex ideas, learn from experience, reason, and solve problems.
Rigorously Scientific
Adhering strictly to empirical standards and methods in research or study to ensure validity, reliability, and accuracy.
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