1. CHAPTER 13: THE ENVIRONMENT AND CHANGE OVER TIME

2. Lesson 1: FOSSIL EVIDENCE OF EVOLUTION

3. ?? Essential Questions How do fossils form?
How do scientists date fossils?
How are fossils evidence of biological evolution?

4. Vocabulary Fossil Record Geologic Time Scale Mold Extinction Cast
Biological Evolution
Trace Fossil

5. The Fossil Record
The fossil record is made up of all the fossils ever discovered on Earth

6. Fossil Formation
Only the dead animal’s hard part, such as bones, shells, and teeth, remain
Mineralization
Minerals replace the organism’s
original material and harden into
a rock

7. Fossil Formation Carbonization Molds and Casts
When a dead organism is compressed over time and pressure drives off the organism’s liquid and gases
Molds and Casts
The impression of an organism in a rock is called a mold
A cast is a fossil copy of an organism in a rock

8. Fossil Formation Trace Fossils Original Material
A trace fossil is the preserved evidence of the activity of an organism
Original Material

9. Determining a Fossil’s Age
Relative-Age Dating
Absolute-Age Dating

10. Fossils over Time The Geologic Time Scale Dividing Time
The geologic time scale is
a chart that divides Earth’s
history into different time
units
Dividing Time

11. Extinctions
Extinctions occurs when the last individual organism of a species dies
Environmental Change
Sudden Changes
Gradual Changes
Extinctions and Evolution
Biological evolution is the change over time in populations of related organisms

12. Classwork
Page 468 #1-9 Write down questions and answers Workbook page