Summary
Zooms out to look at Earth's structure — crust, mantle, outer core, and inner core — and explains how geologists know what's inside a planet they can never actually visit.
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Teaching resources
Discussion questions
Discussion
- What are the four layers of Earth from the surface to the center?
- What is the crust made of? Is it the same everywhere?
- How do scientists study the inside of Earth if they can't drill all the way down?
- Why is the inner core solid even though it is hotter than the outer core?
Quick work-a-long
Vocabulary: crust, mantle, outer core, inner core, seismic wave, geologist.
Try it: Draw Earth as a cut-away diagram. Label and color each layer and write one fact about each (temperature, thickness, or state of matter).