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

Niet gecategoriseerd

Thames & Kosmos

36 pagina's

PDF beschikbaar

Handleiding

EARTH PROVIDES US

WITH A WEALTH OF

VALUABLE AND

USEFUL MATERIALS:

MINERALS

Rocks that have a uniform chemical

composition are called minerals.

Almost all minerals have specific,

identifiable crystal structures —

regular shapes the repeat over and

over.

ROCKS

While pure minerals are rather rare, there

are huge quantities of rocks, such as

granite and limestone, in Earth’s crust —

they actually make up the majority of it.

Rocks are composed of a mixture of various

minerals, and the type and quantity of

these minerals determines the type of rock.

You will find samples of a few important

types of rocks in this kit.

WHAT ARE GEODES?

Crystals can form in small or large

spaces inside rocks. Crystal-filled

rocks and hollow spaces of this type

are called geodes, which is derived

from a Greek word meaning

“earthlike.” Natural geodes

form slowly over long periods

of time, hidden inside rocks. In

the previous experiment, you made

a model of a geode that formed much faster!

TIP !

A whole, intact geode can make a nice

gift. You can get extra gypsum (plaster or

plaster of Paris mix) in a hobby store, and you can

order more alum from online chemical suppliers.

Did you know …

… THAT THE WORD “CRYSTAL”

COMES FROM THE GREEK LANGUAGE?

Over 2,000 years ago, the Greeks imagined certain colorless crystals that they found

in the mountains to be a kind of permanent water ice — an ice that at one time had

frozen so deeply that it would never melt again. The Greeks called this water ice

“krystallos,” and they also gave the same name to these colorless objects. You will

find a quartz crystal in this experiment kit.

Energy sources:

coal and oil

Building materials:

rock, clay, and sand

Rock salt for seasoning

Lime for cement

production

Ore for refining

into metals

Sulfur is a raw

material for the

chemical industry.

Precious gems:

diamonds and rubies

Homemade Crystals

CHECK IT OUT

Bekijk gratis de handleiding van Thames & Kosmos Kids First: Crystals, Rocks & Minerals, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.