# Layers of the Earth

#### Summary

Students use graphs of seismic wave travel times, and value for the diameter of Earth obtained in the Size of the Earth activity, to investigate the internal structure of the Earth and determine that it is layered.

Click here to view the full activity on the Kéyah Math Project website.

Click here to view the full activity on the Kéyah Math Project website.

## Learning Goals

**Objectives**

**Mathematical Skills**

## Context for Use

This activity consists of a set of quantitative problem-solving exercises that can be used as an in-class activity or an assignment in any introductory course with a unit on Earth structure, plate tectonics, or seismology, such as:

Physical geology or physical geography

Historical geology or Earth history

Environmental geology, natural hazards, natural disasters

Earth system science

Earth materials

## Description and Teaching Materials

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## Teaching Notes and Tips

An Instructor's Guide to all Kéyah Math activities is available online from the Instructor Resources page on the Kéyah Math website.

## Assessment

Students record their work and answers in a word-processor document or a notebook, which can be submitted to the instructor for assessment. Solutions to these problems are available online from the Instructor Resources page on the Kéyah Math website.

## References and Resources

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