Skeleton

Once there was a boy and he (and his class) was studding about the skeleton and the bones. He found out that there are many bones in your skeleton. Soon he knew that there are 206 bones in an adults body. He was interested on finding out that a bone is made out of. The surface of the bone is called the periosteum. The layer after that is made out of compact bone. A compact bone is smooth but very hard. After that there are many layers of the cancellous. Cancellous is not as hard as the compact bone but the bone is very strong. Now the boy found this very interesting. The thing was that in most bones the cancellous protects the most inner part of your bone called the bone marrow and the bone marrow's job is too make blood cells. The boy had a very interesting session with his class about the skeleton and bones and then he told everyone everything he knew about bones.