What's Down Under? Keyword: CORE

Earth "jerks" slightly as it spins, due to electrical currents from its interior.

Surface and Interior of Earth

Check out this great site on planet Earth from the University of Michigan. Click any of the hot words (printed in blue) to go further into the site. You also can click Beginner, Intermediate, or Advanced at the top of the screen.

		Questions How did the Hawaiian Islands form? What is the temperature of Earth's core? How does this temperature compare to the temperature of the Sun's surface? How does subduction contribute to the recycling of Earth's atmosphere?

Earthquakes

Learn all about earthquakes at this site from The Tech Museum of Innovation in San Jose, California. Keep clicking the "Next" button in the upper right hand corner, or jump around the site using the buttons at the bottom of the screen.

		Questions How many countries and seismographs are involved in the Worldwide Seismographic Station Network? Where are the seismographs kept? How many seismographs are needed to locate exactly where an earthquake is occurring? Why is this number necessary? What happened on October 17th, 1989?

Understanding Earthquakes

Here you'll find lots of information on earthquakes and Earth's interior. Click Rotating Globe to see where earthquakes occur around the world. Click How Earthquakes Occur for an explanation of earthquakes that uses animation. Or click Famous Earthquake Accounts to read reports from Mark Twain, Jack London, and other famous writers.

		Questions Why was the Lisbon earthquake of 1755 significant? In 1960, an earthquake in Chile caused a huge tsunami. Name the different places the tsunami struck. How many miles did it travel? Harry Fielding Reid studied the 1906 San Francisco earthquake. What did he discover from his studies?