Final answer:
The evidence for events on geologic time scales comes from the study of rocks, minerals, and fossils, as well as radiometric dating. The geologic time scale divides Earth's history based on major changes in geology, climate, and the evolution of life. By creating their own geologic time scale using a roll of paper and labeling different divisions, students can better understand the concept of geologic time.
Step-by-step explanation:
The evidence for events that have occurred on geologic time scales comes from various sources such as the study of rocks, minerals, and fossils, as well as radiometric dating. These methods help geologists piece together the history of Earth and its life. For example, the geologic time scale is a tool that divides Earth's history into divisions based on major changes in geology, climate, and the evolution of life. By studying these divisions and the events associated with them, geologists can gain insights into the past.One way to create a geologic time scale is by using a 2.5 m long roll of paper and assigning a scale where 1 cm represents 20 million years. Tick marks can be placed every 100 million years to indicate different time periods. By labeling the Precambrian eon, its associated eras, and the epochs of the Cenozoic era, students can visualize the different divisions of geologic time.To determine the ages of specific events, geologists use relative dating, which involves comparing the ages of different rocks or objects, and radiometric dating, which measures the decay of radioactive isotopes in rocks or fossils. By comparing the ages obtained from these methods to their own estimates, students can assess how close their guesses were to the actual ages of the events.