Unit 6 Lesson 3 What Is Soil? Copyright Houghton Mifflin Harcourt Publishing Company

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2 Soil Is Not Just Dirt When you are in a forest or garden, what is under your feet? Below the sticks, rocks, and plants, there is soil.

3 Soil Is Not Just Dirt What is soil? What are parts of soil? Soil is a mixture of water, air, tiny pieces of rock, and humus.

4 Soil Is Not Just Dirt Humus is a rich mixture of the decomposed, or broken down, remains of plants and animals.

5 Soil Is Not Just Dirt

6 Soil Is Not Just Dirt

7 Soil Is Not Just Dirt

8 Soil Is Not Just Dirt There are many kinds of soil. Soil can be red, black, brown, gray, and even Soil can also be moist or dry. It can contain different types of minerals even gold!

9 Soil Is Not Just Dirt Some kinds of soil are better for growing plants than other kinds. Soil that is very good for plants is fertile. Soil can take hundreds or even thousands of years to form. Because soil is an important natural resource, it must be conserved.

10 How Does Soil Form? A top layer of soil is called topsoil. It is the most fertile soil layer. Plants grow in the topsoil. Topsoil is fertile because it contains humus. Humus makes soil darker.

11 How Does Soil Form? The layer beneath topsoil is called subsoil. Subsoil does not have a lot of humus, but it does have small pieces of rock.

12 How Does Soil Form? If you dig deep enough into the soil, you will reach solid rock. This is bedrock.

13 How Does Soil Form? Video How does soil form? It forms from bedrock. 1) When bedrock is at the Earth s surface, it breaks down by weathering. 2)Eventually, bedrock is broken into small bits of rock. These mix with air, water, and humus to form soil.

14 How Does Soil Form? Take a look at the layers of the soil. What does each layer contain?

15 How Does Soil Form?

16 How Does Soil Form?

17 How Does Soil Form?

18 Types of Soil There are more than 70,000 kinds of soil in the United States alone! What makes them different from one another? One way to distinguish soils is the size of their particles.

19 Types of Soil Tiny particles of rock that you can see with just your eyes are called sand.

20 Types of Soil Silt is tiny particles of rock that are difficult to see with only your eyes.

21 Types of Soil Particles of rock that are even smaller than silt are called clay. Clay holds more water so its moist and its texture is smooth.

22 Types of Soil The amounts of sand, silt, and clay in soil give it texture. Texture is how the soil feels in your hands. Soil with more sand feels rough, while soil with more clay feels smooth. Soils can be made up of different minerals, depending on the area where the soils formed.

23 Types of Soil

24 Plants Need Soil Plants need water and light to grow. They also need nutrients. Nutrients are substances that plants take in from the soil through their roots to help them live and grow. The best kind of soil for most plants is called loam.

25 Plants Need Soil Loam has a balance of silt, sand, and clay. Loam is rich in nutrients and humus. It stays moist, and it is easy to dig. However, some plants grow better in other soil types.

26 Plants Need Soil

27 Why It Matters Composting Don t throw away that banana peel! You can use fruit peels and other kitchen scraps to help plants grow. Compost is humus that you make yourself.

28 Composting 1. Pile plant parts, such as dried leaves and grass, into a big container. 2. Then add scraps of fruits and vegetables. Tiny organisms too small to see will decompose the scraps to make humus. 3. Spread compost on your plants so they will grow quickly and stay healthy.

29 Composting Compost does more than help plants in your garden. Making compost means that you don t throw away as much garbage. When people throw away less garbage, that s good for everyone!

30 Composting

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