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Review the words particle, sand, silt, clay, texture. Re-read the part of The Soil Explorers where some students discover that the red and brown soils feel different. Have the students give reasons why soils might feel different. Introduce the fact that the tiny pieces of soil, called particles, are really different sizes. Show the particle relative size chart and introduce the terms sand, silt , and clay. Have the students feel samples of sand, clay, and moist flour and describe how each feels. Discuss that differing amounts of sand, silt, and clay in soil affects soil texture sticky, sandy soil is gritty and rough, silty soil feels soft and smooth. Tell the students that they will now have a chance to examine the particle sizes in their own soil samples. Also discuss about how sand, silt and clay effect the growing conditions(plant succession) in an area. Collect the data from various places and have students to compare and make predictions about the plant/animal succession in the reservation.
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