R20e(STRATUM FORMING)

PURPOSE

This model is effective for teaching about forming stratums.

This model does not need big experiment tools (as a long water tube).

TARGET

Elementary school students (6th Grade)

CATEGORY

Earth sciences

Geology

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

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.

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)

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)

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8