1. Daily Warm-Up Exercises
Day 28
What are destructive Earth processes?
Destructive processes break down old landforms. examples: weathering; erosion; tectonic plates sinking and melting
What are constructive Earth processes?
Constructive processes build new land forms. examples: mountain building; deposition; new crust formation
What's the difference between weathering, erosion, transport, and deposition?
Weathering is when rocks get broken into small pieces.
Erosion is when wind or moving water picks up the pieces.
Transport is when wind or water carries the pieces from one place to another.
Deposition is when the wind or water slows and the pieces settle and stop moving.
Daily Warm-Up Exercises
Daily Warm-Up Exercises 1

2. Mini Geologic Time Lines (Part 3)
Investigation 6
It's About Time

3. Mini Time Lines
Each pair will make a time line on adding-machine tape.
Your time line will be 4.5 meters long.
What scale will we need to use to represent 4.5 billion years?
1 mm = 1 million years 3
Daily Warm-Up Exercises 3

4. Geological Eras
Geologists have divided Earth's history into four eras based on the kinds of organisms that existed at the time.
Cenozoic
Mesozoic
Paleozoic
Precambrian 4
Daily Warm-Up Exercises 4

5. Geological Periods
Geologists further divided the eras into periods based on major events that took place in Earth's crust. For example, the Mesozoic Era is divided into three periods.
Mesozoic Era
Cretaceous period
Jurassic period
Triassic period 5
Daily Warm-Up Exercises 5

6. Now
Turn to the Earth History Time Line on page 51. Your task is to divide your 4.5-meter adding-machine tape into eras and periods.
Draw a line at one end of your tape and label it "Now." 6
Daily Warm-Up Exercises 6

7. Quaternary Period The Quaternary period started 1.6 mya.
How many millimeters is that?
1 million years = 1 millimeter, so 1.6 million years = 1.6 millimeters
Draw a line 1.6 mm from the Now line and label that tiny section the "Quaternary Period." 7
Daily Warm-Up Exercises 7

8. Tertiary Period The Tertiary period started 66 mya.
How many millimeters is that?
1 million years = 1 millimeter, so 66 million years = 6.6 centimeters
Draw a line 6.6 cm from the Now line and label that section the Tertiary Period." 8
Daily Warm-Up Exercises 8

9. VERY IMPORTANT!!! All measurements must be made from the Now line.
The zero end of the ruler must always stay on the Now line. 9
Daily Warm-Up Exercises 9

10. Mark Eras
When you finish all the periods, go back and draw a heavy line to mark the beginning of each era.
Label the era by writing its name across the periods. 10
Daily Warm-Up Exercises 10