Thames & Kosmos Kids First: Crystals, Rocks & Minerals handleiding

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Handleiding

WHAT’S HAPPENING

Over time, sand that has been deposited by water can become compressed and solid. The cause is usually the

mineral lime that has penetrated and cemented the grains of sand together. This type of rock is called

sedimentary rock. With gypsum and some food coloring, you have replicated this process and created artificial

sandstone similar to the naturally colored sandstone of the Arizona desert. The gypsum cements the grains of

sand together, and the dyes imitate the reddish brown iron compounds found in actual red sandstone.

TIP !

You can experiment with the

different colors of sand that you

might find near where you live.

Rocks: Building Blocks

of Our Earth

Plaster layers

YOU WILL NEED

› Small measuring cup

› Plaster gypsum

› Food coloring, blue

› Wooden spatula

› Double-ended measuring spoon

› Small cardboard box

› Sand

› Red, blue, and yellow food coloring or

watercolor paints

› Empty yogurt cups

HERE’S HOW

1. In the yogurt container, stir together some

sand with half the quantity of gypsum.

2. Add three to five spoonfuls of red coloring,

two spoonfuls of blue coloring, and a little

yellow coloring.

3. Mix everything together thoroughly and

slowly add water until you get a reddish

brown mush.

4. Pour this into the cardboard box and let it

harden.

5. Repeat this mixing process with different

color ingredients or without coloring, and

gradually layer the sand and gypsum

mixtures on top of one another. Let the

plaster harden overnight in the box.

6. Break apart the rock tablets, and roughen

the surface a little to make it look more

realistic.

3 4

Sand

Over night

TIP !

Let each new layer of

plaster harden well before

adding the next layer on

top of it.

Rocks: Building Blocks of Our Earth

EXPERIMENT 15

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