MODEL OF STRATUM FORMING |
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| PURPOSE |
| This model is effective for teaching about forming stratums. |
| This model does not need big experiment tools (as a long water tube). |
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| TARGET |
| Elementary school students (6th Grade) |
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| CATEGORY |
| Earth sciences Geology |
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| MATERIALS |
| Plastic test tube (diameter: 16mm length: 100mm) …1 Cap (for diameter: 15~17mm) …1 Glass beads diameter: 0.09~0.18mm Glass beads diameter: 0.25~0.50mm Glass beads diameter: 0.71~1.19mm 4% polyvinyl alcohol aqueous solution …10mL Oiliness acrylic color spray …3 colors |
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| HOW TO MAKE |
| - By each size glass beads are colored by acryl color spray. |
| - Mix three kinds of colored glass beads. |
| - Put beads in and pile up until 1cm from the bottom end of the tube as shown in Fig.2. |
| - Inject a 4% PVA (polyvinyl alcohol aqueous solution) to the tube. |
| - Make a small hole for ventilation to the cap. (The hole will be closed by PVA) |
| - Close the cap calmly as shown in Fig.3. |
| - Stir well to mix a liquid and beads as shown in Fig.4. |
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| HOW TO USE |
| - Shake the tube in order glass beads to be mixed uniformly. |
| - Put it for about a minute in a vertical state. |
| - Glass beads make stratums. (cf.Fig.5) |
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| DEVELOPMENT |
| - Not only beads, but you can use sands or alumina balls instead. |
| - If a tube is being left for a long time, particles in the tube are not mix easily. This is demonstrating the process of changing sand into rock. (cf.Fig.6) |
| - You can make more stratums by using silicon tube. (cf.Fig.7,8) |
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Fig.1 |
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 Fig.2 |
|  Fig.3 |
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 Fig.4 |
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 Fig.5 |
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 Fig.6 |
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 Fig.7 |
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 Fig.8 |
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