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Geological Time Scale

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  • Pages: 2
  • Word count: 362
  • Category: Earth time

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Understanding geologic time is critical to relating events in Earth鈥檚 history to those of today. Scientists use several forms of the geologic time scale to classify the age of objects and to become familiar with other events occurring simultaneously. In this lesson you will: 路Examine how the geologic time scale summarizes Earth’s history 路Analyze physical and biological changes that have occurred over time 路Identify major events that occurred in geologic time

路Observe the model of the geologic time scale
1.Below you have been provided with a scaled chart to show the geological time scale. Each ___ represents 1 centimeter. The beginning of Earth was 4.6 billion years ago and is represented as 4.6 meters, therefore each centimeter represents 10 million years. For the sake of inputting data some rows will be larger than others, however each 10 million years is correctly represented in the Eon column. 2.You will need to complete the scale by choosing the appropriate drop down field as well as recording significant biological and geological events. Because the scale has been provided for you, the majority of your grade will be based on the information you gather for events. 3.Read the Observations and keep and pay close attention while gathering data. 4.After you have completed the scale answer the Reflection Questions. Observations

路Examine how the geologic time scale summarizes Earth’s history
路Pay close attention to last 540 million years
路During the last 540 million years observe how quickly complex life evolved
路Notice the amount of time humans have been in existence compared to the creation of Earth. Reflection Questions (10 points)

Do not answer until you have completed scale below
1.Explain how the scale provided is designed to show the Earth鈥檚 history and show the calculations: 2.Based on the scale, how much longer (in centimeters) was the time before the Phanerozoic Eon compared to the rest of the scale? 3.How many 鈥測ears鈥 separate the dinosaurs from humans on Earth?

4.Were you surprised by the length of the time scale when you saw it on a continuous piece of paper? Why or why not? Explain your answer as it relates to the scope of Earth鈥檚 geologic past.

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