The dark, stable, organic component of soil, formed by soil microorganisms that break down plant and animal matter. It contributes substantially to the nutrient content of the soil.

This is the final product of composting: a process of breaking down organic materials like food scraps and yard waste.

Shows each soil "horizon" from the soil surface all the way down to the parent bedrock.

Which soil horizon is dark colored, holds lots of organic material, and includes the topsoil?

Which soil horizon holds most of the dissolved minerals and includes the subsoil?

Which soil horizon includes the native weathered bedrock but supplies very little nutrient for the roots?

Which soil horizon includes JUST the native bedrock (unweathered parent material)?

Which horizons are part of the Earth's crust?

Used to calculate the percentages of sand, silt, and clay in a soil sample.

What is the darkest brown soil texture layer on the top of the sediment tubes?

What is the rusty-orange soil texture layer in the middle of the sediment tubes?

What is the golden-yellow soil texture layer on the bottom of the sediment tubes?