摘要：AbstractGeologic time scales is very important concept for understanding earth system events such as global climate change. However, understanding of geologic time scale in a relationship with human history is very difficult because of relatively short period of human existence in earth history. This study shows that Native American elementary students understand geological and historical event based on relative order of earth history. They understand Earth's geological event as a sequential series. More importantly, they understand human history based on their own culture and history.
关键词：Geologic time scale;absolute time;relative time
