prompt: Rewrite this so that a child could understand it
  
  A SIMPLE EXPLANATION
  
  Opal is formed from a solution of silicon dioxide and water. As water runs down through the earth, it picks up silica from sandstone, and carries this silica-rich solution into cracks and voids , caused by natural faults or decomposing fossils. As the water evaporates, it leaves behind a silica deposit. This cycle repeats over very long periods of time, and eventually opal is formed.
  
  Visualise the inside of an opal, like a bag of marbles. The marbles are the silica spheres.
  
  Smaller spheres are more commonly forming, and tend to defract the purple/ blue/ green colours.
  
  Larger spheres are rarer forming, and tend to show off the yellow/ orange/ pink and red colours. Hence why these are the rarer colours to find in Australian Opal.
chosen.role: system
chosen.content: A chat.
chosen.role: user
chosen.content: Rewrite this so that a child could understand it
  
  A SIMPLE EXPLANATION
  
  Opal is formed from a solution of silicon dioxide and water. As water runs down through the earth, it picks up silica from sandstone, and carries this silica-rich solution into cracks and voids , caused by natural faults or decomposing fossils. As the water evaporates, it leaves behind a silica deposit. This cycle repeats over very long periods of time, and eventually opal is formed.
  
  Visualise the inside of an opal, like a bag of marbles. The marbles are the silica spheres.
  
  Smaller spheres are more commonly forming, and tend to defract the purple/ blue/ green colours.
  
  Larger spheres are rarer forming, and tend to show off the yellow/ orange/ pink and red colours. Hence why these are the rarer colours to find in Australian Opal.
chosen.role: assistant
chosen.content: Opal is a special gemstone that is formed in a unique way. Imagine that opal is like a bag of marbles inside the Earth. These marbles are made of a shiny material called silica. Silica is a special kind of sand.
  
  When it rains, the water soaks into the ground and collects some of the silica from the sand. Then, the water travels through tiny cracks and holes in the Earth's rocks. These cracks can be made by things like fossils or natural breaks in the rocks.
  
  As the water with the silica inside it moves through these cracks, something magical happens. The water starts to evaporate, which means it turns into a gas and disappears. But when the water goes away, it leaves behind the silica it carried. Over a very long time, these silica deposits build up and form beautiful opal.
  
  The size of the silica spheres inside the opal is what gives it its colors. Smaller spheres make colors like purple, blue, and green. These colors are more common in opal. But larger spheres are rarer and make colors like yellow, orange, pink, and red. That's why you don't see those colors as often in opal.
rejected.role: system
rejected.content: A chat.
rejected.role: user
rejected.content: Rewrite this so that a child could understand it
  
  A SIMPLE EXPLANATION
  
  Opal is formed from a solution of silicon dioxide and water. As water runs down through the earth, it picks up silica from sandstone, and carries this silica-rich solution into cracks and voids , caused by natural faults or decomposing fossils. As the water evaporates, it leaves behind a silica deposit. This cycle repeats over very long periods of time, and eventually opal is formed.
  
  Visualise the inside of an opal, like a bag of marbles. The marbles are the silica spheres.
  
  Smaller spheres are more commonly forming, and tend to defract the purple/ blue/ green colours.
  
  Larger spheres are rarer forming, and tend to show off the yellow/ orange/ pink and red colours. Hence why these are the rarer colours to find in Australian Opal.
rejected.role: assistant