Plate Tectonics

Earth Structure: A Virtual Journey to the Center of Earth

by Anne E. Egger, Ph.D.

Further Exploration

The Sound of Seismic

J. Louie at the Univ. of Nevada, Reno offers speeded-up recordings of earthquakes as MP3s.

Earthquake Hazards Program at the U.S. Geological Survey

Find information about current and past earthquakes, explore current methods and research.


Inge Lehmann

Inge Lehmann

Andrija Mohorovicic

Andrija Mohorovicic


Seismology in the Days of Old

Journey to the Center of the Earth

An online version of Jules Verne's classic.

News & Events

Project Mohole: Drilling to the Moho

A summary from the National Academy of Sciences about the failed Project Mohole.

Are there nuclear reactors at Earth's core?

A Modest Proposal to Probe the Core

SpaceRef Daily

Current Science News

News from around the world of science.


Earthquake Research at the U.S. Geological Survey

Ongoing research on crustal structure, seismology, and earthquake hazards.

Google Scholar

Google - Research database allows searching of the scholarly literature.


Use Seismograms to Locate an Earthquake

UCLA Geology Labs On-line

Next Generation Science Standards (NGSS)

Earth Structure - Annotated NGSS Module

This annotated version of the Earth Structure module highlights how the three dimensions of NGSS are integrated throughout the text passages.

Next Generation Science Standards: For States, By States

National Academies Press: A Framework for K-12 Science Education