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

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Thames & Kosmos

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Handleiding

WHAT’S HAPPENING

In many regions of Earth, vast stores of salt lie deep

underground. The rock salt deposits come from sections of sea

that were isolated from the oceans and evaporated under a hot

sun. Storms washed dust over the salt deposits, and sometimes

the sea would return and form new salt layers as it

subsequently evaporated again, and ultimately other layers

covered the salt as well. The experiment modeled this process.

As the water evaporated, the salt that was dissolved in it was

left behind.

Rock salt deposits

YOU WILL NEED

› Large measuring cup

› Double-ended measuring spoon

› Table salt

› Deep dish

HERE’S HOW

1. Fill half of the measuring cup with water,

and stir enough salt in it to make a

saturated solution.

2. Pour this homemade “seawater” into the

deep dish, and place the dish in a warm

spot, such as on a radiator or heat vent.

After a few days, the water will evaporate

and leave behind a solid layer of white salt.

EXPERIMENT 16

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