Soil Layers and Composition

What is formed in the O Horizon from decomposing leaves and organic matter?

• Clay

• Minerals

• Humus

• Bedrock

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Which soil layer is also known as topsoil and is rich in minerals and humus, allowing plants to grow strong roots?

• O Horizon

• B Horizon

• A Horizon

• C Horizon

Which soil layer is hard and compact, rich in mineral deposits and clay, and only allows roots of big and strong plants to reach it?

• O Horizon

• A Horizon

• C Horizon

• B Horizon

What is the other name for the C Horizon, which consists of weathered parent rock and contains no plant or organic matter?

• Topsoil

• Subsoil

• Regolith

• Bedrock