The History of the Earth: Supplemental Guide 3A | The Earth Inside-Out, Part II 57

Note: Introducing the Read-Aloud may have activity options that

exceed the time allocated for this part of the lesson. To remain

within the time periods allocated for this portion of the lesson,

you will need to make conscious choices about which activities to

include based on the needs of your students.

Introducing the Read-Aloud 10 minutes

What Have We Already Learned? 5 minutes

Review with students what they learned from the previous read-

aloud about the outermost layer of the earth, the crust. Using the

globe, remind students that the land and water on the surface of

the crust are called continents and oceans. Have students assist

you in locating the North Pole, the South Pole, and the equator.

 Show image 3A-1: Diagram of the layers of the earth

Using the diagram, assist students in naming the layers of the earth:

crust, mantle, outer core, and inner core. Remind students that we

live on the crust, and that the crust is where geologists look to learn

about the history of the earth. The many layers of rock found in the

crust can teach us about different periods of time in Earth’s history.

Ask students to chant and clap three times the three important

words that Gerry the Geologist said to remember when studying

geology. (Heat! Pressure! Time!) Heat, pressure, and time are

important because they cause many changes to the earth.

Essential Background Information or Terms 10 minutes

Explain to students that all things on Earth can be described as

being solid, liquid, or gas. Explain that if something is a solid, it

keeps its shape. Tell students that if you pick up a book and hand

it to someone else, it will still keep its same shape. It keeps its

shape because the book is a solid.

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