Write the answers to the following questions in complete sentences on a piece of paper. Use the buttons located directly under the questions to navigate your way through the lesson to locate the answers. When you have finished the lesson click on the Earth icon so the next group can begin the lesson.

1. Name the four eras of geologic time from the oldest era to the present era

2. What is an index fossil?

3. What two types of changes led to the end of geologic eras?

4. Descibe the process involved in the formation of coal.

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