Grade 1 - A History Of The Earth

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

Explain that if something is a liquid, it can be poured. It doesn’t

keep its shape, but takes on the shape of its container. Show

students two differently shaped clear containers. Have students

watch as you pour water from one container to another. Tell

students that water is a liquid because it takes the shape of

whatever container it is in.

Explain that if something is a gas, it is often hard to see. Explain

that the air around us is a gas. It is not solid because it does not

keep its shape, and it is not liquid because it cannot be poured.

Explain that heat can change things from solids to liquids to

gases. Tell students that an ice cube is the solid form of water.

When heated, an ice cube can melt and become water. When we

boil water, it heats up and becomes water vapor, which is a gas.

Vocabulary Preview 5 minutes

Mantle

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

1. Today you will learn about the layer under Earth’s crust called
   the mantle. [Point to the mantle in the diagram.]


2. Say mantle with me three times.


3. The mantle is the fi rst layer beneath the earth’s crust.


4. Mikayla thought it was interesting that the rock inside the
   mantle moved around.
   Artie explained to his brother that the earth’s mantle was very
   thick, almost 1,800 miles thick!


5. [Point to the mantle.] In this diagram, the mantle is red. Tell
   your partner about the differences between Earth’s crust and
   Earth’s mantle.
   Core


6. Today you will also learn about Earth’s core and that the core
   has two parts: the outer core and the inner core. [Point to the
   outer and inner core in the diagram.]


7. Say core with me three times.


8. The core is the center of an object.