Lesson Plan - Get It!
When you walk on the beach or the shore, do you know you are still walking on soil? How can you tell what kind of soil you are seeing?
Soil looks different because it contains different amounts of minerals, but also different amounts of other materials.
Soil contains three types of particles: sand, silt, and clay. The combination of these three particles defines the soil texture. Have you noticed that soil sometimes feels different?
If you missed or want a refresher on the two previous Soil lessons, find them in the right-hand sidebar under Related Lessons.
Clay is the smallest type of particle found in soils. These tiny particles are able to fit tightly together, leaving very little space in the soil for other substances.
Sand is the largest soil particle, which means you can easily see each grain of sand.
Notice how much space there is between particles in the sand compared to the clay? This space changes the characteristics of the soil.
Silt, the third type of particle, is larger than clay but smaller than sand.
Soils contain some amount of each of these three types of soil particles.
- When a soil has too much sand, water runs through it easily, removing nutrients.
- Soils with a high amount of silt are easier to pick up and erode, but also are easily pushed together.
- Clay-based soils prevent water from flowing through because of the small particle size.
A healthy soil combines all three soil particles so that water is able to move through it slowly, leaving important nutrients and materials in the soil. Review what you have learned, and write down the soil particles in order of increasing size.
In the Got It? section, you will explore the size of soil particles.