Soil Composition/Soil Profile

What are the layers of soil known as?

• Soil Horizons

• Soil Layers

• Earth Strata

• Ground Levels

Which of the following is NOT one of the three types of soil? clay, sand, silt, mud

• clay

• sand

• silt

• mud

What is humus?

• A type of soil that is rich in minerals.

• Organic matter that is formed from the decomposition of plant and animal material.

• A synthetic fertilizer used in agriculture.

• A type of rock found in sedimentary layers.

Which layer is the subsoil?

• Horizon O

• Horizon A

• Horizon B

• Horizon C

What is the difference between soil and dirt?

• Soil is a living ecosystem, while dirt is just displaced soil.

• Soil is found only in forests, while dirt is found everywhere.

• Soil contains no nutrients, while dirt is rich in minerals.

• Soil is a type of rock, while dirt is a type of sand.

What is the term for the uppermost layer of soil that is rich in organic material?

• Subsoil (Horizon B)

• Topsoil (Horizon A)

• Bedrock

• Clay layer

What is the main component of soil?

• Water

• Sand

• Minerals

• Clay

What is the process of soil formation called?

• Soil Erosion

• Pedogenesis

• Soil Compaction

• Soil Fertility

What is the significance of soil pH?

• It determines the color of the soil.

• It affects nutrient availability and microbial activity in the soil.

• It influences the soil's texture and structure.

• It regulates the temperature of the soil.

What is the top layer of soil called?

• Horizon O (Organic layer)

• Horizon A (Topsoil)

• Horizon B (Subsoil)

• Horizon C (Parent material)