The Deep Earth and Other Planets

Introducing the thick rock shell between the crust and core that makes up the bulk of the Earth. For more, see the Earth's Mantle category.

An introduction to the composition and structure of the core.

A hundred years ago the secret of Earth's eternal youth was discovered: radioactive heating.

Should geologists care what kind of planet Pluto is?

Planets have gone from gods, to worlds, to mere examples of a species.

Rocks from the Moon, Mars and Venus are (or might be) found on Earth too.

Who wants to be a geo-whiz? The trivia game--subject: OTHER PLANETS.

It's an open-book quiz on geological topics in the atmosphere and outer space--but you must put your rock hammer DOWN!

Studying the Sun tells a lot about the Earth.

How we study Earth motions and changes with fantastically accurate gravity meters.

Two rare metals yield deep geologic clues.

Why every day is a little different by a few milliseconds—part of the "Earth Science in Space" series.

The layers of the planet shown and labeled, suitable for homework, from the U.S. Geological Survey.

Maps for each continent from the University of Karlsrühe, Germany.