science09

__Geodes__ media type="file" key="9.wav" width="300" height="50" I chose geodes because I think they're fascinating. Over a period of thousands of years (estimaied 240 million years) layers of silica cool different crystals within the cavity. Different types of crystals silica cools at varying temperatures, thus creating layers of different types of minerals and crystals. A geode's outside (or crust) is made of a clay film between the geode wall and the enclosing limestone matrix. Geodes are found in Arizona and other places near there. So now you can see that I chose geodes because they are amazing stones.



__Comments from Teachers during the research process:__


 * Note from Mr. Kleyn. Are you also going to use electronic resources? Great questions. Keep up the good thinking!

Note from Mr. VanOrden: What an excellent group of questions. They are all very interesting. I read one time that there are two different ways that geodes can form. I also thought it was interesting that the word "geode" comes from the Greek word "geodes" which means "earthlike" I wonder why scientists would use that word?

Note from Mrs. Smith: Wouldn't it be fun research to get a geode and break it open yourself? You chose a topic that was very tricky to find research for ~ I know how hard you worked to find these great facts! Nicely written, and great recording of you reading it.