All materials left by the human race become the subjects of archeological study. In archeology, not only expensive materials like golden relics, treasure boxes and weapons, but also small piece of broken bowl, a dish or a rock is treated preciously. They include all natural
objects of human relationships like animal bones and botanical seeds in addition to the
devices made directly by a human being. Through this, we can examine the climate and
environment in which a human being had a life.