What is Soil? - Definition, Structure & Types

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  • 0:07 What Is Soil?
  • 1:31 Soil Profile and Soil Horizons
  • 2:39 Types of Soil
  • 4:35 Soil Aggregates and…
  • 6:23 Lesson Summary
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Lesson Transcript
Rebecca Gillaspy

Dr. Gillaspy has taught health science at University of Phoenix and Ashford University and has a degree from Palmer College of Chiropractic.

Expert Contributor
Shelby DeVore

Shelby has a BS in Animal Science and a MS in Agriculture and Natural Resources. She taught high school and college animal science and biology courses for over 5 years.

Soil is the material found on the surface of the earth that is composed of organic and inorganic material. Soil varies due to its structure and composition. Learn about the different types of soil and soil structures in this video lesson.

What Is Soil?

Chances are that you haven't thought a lot about the soil under your feet, but you may be surprised at the complexity of soil. Soil varies in its composition and the structure of its particles, and these factors are closely examined by farmers, who need appropriate soil for planting crops, as well as engineers who may need to understand how soil is going to hold up under different demands. Soil is also vitally important to the sustainability of an ecosystem because it serves as the natural medium for the growth of vegetation. In this lesson, you will discover just what soil is and which factors are looked at when determining the structure and the types of soil.

So, what exactly is soil? Soil can be defined as the organic and inorganic materials on the surface of the earth that provide the medium for plant growth. Soil develops slowly over time and is composed of many different materials. Inorganic materials, or those materials that are not living, include weathered rocks and minerals. Weathering is the mechanical or chemical process by which rocks are broken down into smaller pieces. As rocks are broken down, they mix with organic materials, which are those materials that originate from living organisms. For example, plants and animals die and decompose, releasing nutrients back into the soil.

Soil Profile and Soil Horizons

Now, if you look down at the soil under your feet, you cannot tell very much about that soil. So, when you study soil, it's helpful to grab a shovel and dig a hole that is big enough to reveal a vertical section of soil that ranges from the surface to the underlying rock, referred to as a soil profile. The soil profile is somewhat like the soil's fingerprint, and it will differ from other soil samples based on factors like its color, texture, structure and thickness, as well as its chemical composition.

Each layer of a soil profile is referred to as a soil horizon. These horizons are identified by letters. Horizon A is the upper layer, closest to the surface. You can think of this horizon as the topsoil. In fact, you can use this as a memory jogger to help remember the order of the horizons. The letter A is at the top of the alphabet and refers to the topsoil layer. As you move deeper into the layers of the soil profile, you have horizons B and C, giving us the three main horizons.

Types of Soil

There are three basic types of soil: sand, silt and clay. But, most soils are composed of a combination of the different types. How they mix will determine the texture of the soil, or, in other words, how the soil looks and feels.

One type of soil is sand. Sand within soil is actually small particles of weathered rock. Sand is fairly coarse and loose so water is able to drain through it easily. While this is good for drainage, it is not good for growing plants because sandy soil will not hold water or nutrients.

Silt is another type of soil. Silt can be thought of as fine sand, and it will hold water better than sand. If you were to hold a handful of dry silt in your hand, it would feel almost like flour. If you were to add water to the silt in your hand, it would do a fair job of holding the water and feels slick and smooth.

Clay is very fine-grained soil. Its particles are even smaller than silt, so there is very little space between the fine grains for air or water to circulate. Therefore, clay does not drain well or provide space for plant roots to flourish. If you were a farmer, you would not want your field to be mostly clay. However, if you were a potter, you would think clay was the best type of soil. When moisture is added to clay, it can be molded into shapes, such as a pottery bowl or a building brick.

Now, we can consider loam as our fourth type of soil, even though it is really a combination of sand, silt and clay. Loam will vary depending on how much of each component is present, but generally if you are a gardener, this is the type of soil you want because it holds moisture, but also allows for good drainage. If you were to hold loam in your hand, you could mold it into a ball, but the ball would easily crumble when disturbed.

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Additional Activities

Research Questions

1. There are twelve types of soil. Research the twelve types of soil and determine what they are. Explain the characteristics of the twelve types of soil.

2. The twelve types of soil can be classified according to their composition. The soil texture triangle can be used to illustrate the composition of the soil types. Draw a picture of the soil texture triangle. Describe how this useful tool can explain the differences and similarities between the different types of soil.

3. Some soils are better suited to growing crops than other soils. Choose three crops and research the ideal soil for growing each crop. Explain why those soils are the best growing environment for the crops that you chose.

4. The parent soil is the horizon from which the soil is composed. Find out where the horizon of parent soils are located. Research what the parent soil in your area is. How does the parent soil contribute to the other layers of soil in your area?

5. You can determine the type of soil by conducting soil tests. A soil test can be performed with a lab kit or a combination of simple procedures in your backyard. Research the methods that you can use to determine the texture of the soil in your backyard. What are some of the things that you need to determine soil texture? Explain how you can conduct soil tests without a lab kit.

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