Small intestine. The small intestine is made up of the duodenum, jejunum, and ileum. Together with the esophagus, large intestine, and the stomach, it forms the gastrointestinal tract. In living humans, the small intestine alone measures about 6 to 7 meters long.After death, this length can increase by up to half.mall intestine. The small intestine is made up of the duodenum, jejunum, and ileum. Together with the esophagus, large intestine, and the stomach, it forms the gastrointestinal tract. In living humans, the small intestine alone measures about 6 to 7 meters long. After death, this length can increase by up to half.
Obsidian: Characteristics and Properties. Obsidian is the result of volcanic lava coming in contact with water. Often the lava pours into a lake or ocean and is cooled quickly. This process produces a glassy texture in the resulting rock.Iron and magnesium give the obsidian a dark green to black color.ften the lava pours into a lake or ocean and is cooled quickly. This process produces a glassy texture in the resulting rock. Iron and magnesium give the obsidian a dark green to black color.
Obsidian Rock. Obsidian rock is actually a type of glass that formed when molten lava cooled so quickly, there was not time for any crystals to form. The actual composition of the rock is dependent on what minerals, gases, and such were in the immediate area when the lava cooled.bsidian stone can be found almost anywhere there has been volcanic activity in the past, but not all the sources are currently being mined. Most mining is done in Armenia, Greece, Hungary, Iceland, Italy, Japan, Java, Kenya, Mexico, New Zealand, Scotland and Turkey.