Jonathan began his lesson today by reviewing Weathering using the Brain Pop quiz. He got 100% and has learned many basic concepts about weathering. The special topic highlighted today was the study of caves. We started the lesson by using a web cam to take a trip inside a cavern in the state of Washington. Jonathan learned about the terms stalagtite and stalagmite. The lesson included the concept of how the caves are formed. Websites were used to develop the topic. Jonathan learned about the cause of caves by watching a PowerPoint presentation I was building for him while working from a science web site. Jonathan learned that caves are generally made from limestone. The limestone is a sedimentary rock which is is carved out by the action of acids formed in nature. The first acid which Jonathan learned was carbonic acid. It is formed by combining the carbon dioxide in the air and the oxygen in water. This is considered a weak acid. Another acid which is formed when decayed leaves and animal matter produces hydrogen sulfide. This substance combines with the oxygen in the water and becomes sulfuric acid. This is a very strong acid which can carve out the limestone. Jonathn is creating a cave drawing and he will be working on making flashcards with new vocabulary words next week.