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Transcript
Soil TEK 1.7: Earth and space. The student knows that the natural world includes rocks, soil, and water that can be observed in cycles, patterns, and systems. The student is expected to: A: observe, compare, describe, and sort components of soil by size, texture, and color. What term do scientist have for dirt? • It looks like this boy is making a mess in the dirt. A scientist would say that he is playing in the soil. • Scientists call dirt soil. Who needs soil? • Soil is one of the most important things on our planet. • It is important for plants. • It is important for animals. • And it is important for you. What is soil? • Soil is a mix of clay, bits of rock, and humus. What is humus? • Humus is tiny bits of plants and animals that were once alive. How is soil formed? • First tiny bits of rock break off from bigger rocks. These tiny bits are the start of dirt. How is soil formed? • The bits of rock mix with moss and dead leaves. Dust from the air mixes in, too. How is soil formed? • When animals die, their bodies break down and are added to the mix. How long does it take for soil to form? • It takes over 100 years to make one inch of soil. Are all soils alike? • Sandy soil has little humus. It does not hold water well. Cactus roots can take in water quickly. Cactus stems are able to store the water. Are all soils alike? • Clay holds a lot of water. Too much clay in soil is not good. The clay gets hard and dry in hot weather. It packs together so roots can’t grow. Are all soils alike? • Roses need soil with lots of humus. Humus is what makes a soil dark. Humus has the nutrients that plants need to grow. Most plants grow well in humus. What is the work of soil? • Soil helps hold the roots of all plants in place. The roots of plants take in water from the soil. They also take in nutrients from the soil. Who needs soil? • • • • Look that stuff on your shoes. It is important. It is important for plants. It is important for animals. And it is important for you!