About the
The Earth?s Layers
Lesson
Summary
A lesson on the Earth?s layers
Lesson Objectives
• To introduce students to the three layers of the Earth.
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To introduce students to the secondary layers of the core and mantle.
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To provide details about the contents, thickness, and other characteristics of each layer.
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To present exercises that test students? understanding of the Earth?s layers.
Suggested Grades
4th Grade
5th Grade
6th Grade
Lesson Excerpt
Have you ever heard that the Earth?s center is made up of lava? While that is not technically true, the core is partially liquid. This liquid layer is called the outer core because it surrounds the inner core. It is made up of iron and another metal called nickel. It also contains sulfur. The outer core is kept very hot by the Earth?s inner core. When elements like metal get very hot they become molten, or liquid. The outer core is about 2300 kilometers thick.
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