Crystals

 Crystals have been growing inside the earth for over a billion years.    
 Crystals are still growing miles beneath your feet.      
 A natural crystal takes thousands or even millions of years to grow.    
 Forces of nature build crystals from atoms and molecules.      
     

 Growing Crystals

   

 To grow crystals you do not need any special equipment.
   
       

 All you need is plastic vessels or jars and different sized rocks.

Heat a kettle of water.
   

     

  Substances are dissolved in hot water, making them supersaturated.  Let the solution cool down.
   
   

 

Add a rock to the solution to give the crytals something to attach to and grow on. 
   

 
   

 

 Excess molecules can't stay dissolved.

 

 They change over into solid state and start to form crystals.
   

 
   
       
     

 They are supersaturated (contains as much chemical as can be dissolved at room temperature.)