... for it to be clear. Another factor is the amount of space they have to grow in, or if they, in fact, have the room to grow such as in geodes. 4. How long does it take for crystals to form? If the minerals are deep in the earth and slowly come to the surface it can take a long time to cool ... take years to complete in a large body of water. This is where most of the salt we use comes from, the old beds of dried up oceans. 5. What is a geode? Geodes are hollow globular bodies that can come in very small to large sizes. They are sedimentary rocks and are usually formed in groundwater (sur...

• Word Count: 2348
• Approx Pages: 9
• Has Bibliography
• Grade Level: High School