1. Daily Warm-Up Exercises
Day 27
What do numeric time scales show?
Numeric time scales use numbers to show how many years ago different things happened.
What do proportional time scales show?
Proportional time scales show how different parts of Earth’s history compare to the whole.
What does a proportion show?
how a part relates to the whole
Daily Warm-Up Exercises 1
Daily Warm-Up Exercises

2. Use of Color in Diagrams
Exercise 6.1
Exercise 6.1   Image comprehension focus: Color   Goal: To indicate how color can be used to indicate relationships between the components of an image Module Images: CaSE Resources book, page 44 Type of Activity: Teacher Comment Overview: This activity provides students with an experience where they can see that color can be used to illustrate relationships between parts of an image. >>>next slide<<<   2

3. CaSE Book Student Resources Book, page 44
Procedure: Direct students to look at the CaSE Resources book, page 44
Ask the students what they notice with respect to the colors used in the image. [They are various shades of brown.] Note that in the lower image, the events are ordered with respect to time and ask them if there is a pattern with respect to the color [The pattern is that the color is darker the more distant the event]. The teacher should note that this diagram is an example of how color can be used to convey information (the color illustrates which event occurred first)
>>>end of exercise<<< 3

4. Class Geologic Time Line (Part 2)
Investigation 6
It's About Time

5. Age of Earth
Geologists and astronomers have determined that Earth came into existence about 4.5 billion years ago
That's the same as 4,500,000,000 years ago.

6. Daily Warm-Up Exercises
Discuss
What are the similarities and differences between an era and period?
They both are used in time scales to represent an amount of time. An era contains periods. Periods make up an era. For example, the Jurassic Period is located within the Mesozoic Era.
What do many of a rock's features depend on?
Where and how the rock was formed.
Daily Warm-Up Exercises 6
Daily Warm-Up Exercises 6

7. Earth Time Line
Today, we will create a time line to represent the history of Earth.
If we use a scale of 1 cm for 1 million years, how long (meters) will the timeline be?
45 meters
Set up your notebook, to record the events presented in the upcoming activity. Title it:
Earth Time Line Facts

8. Concluding Activity
Turn to Response Sheet -- It's About Time on page 49.
Complete this page individually.

9. Daily Warm-Up Exercises
Homework
What was one thing that impressed you about seeing the Earth time line rolled out in front of you? Explain.
Why do you think we know more about Earth’s recent history than we do about its early history? Explain.
Daily Warm-Up Exercises