Later he became involved in the research of the rare earth elements.

China was already a world leader in certain areas such as rare earth elements.

Separation of the rare earth elements is a step in the later processing.

Is the domestic production of rare earth elements essential to American economic and national security interests?

But first, they must gather the three rare elements that power the device.

Finding rare earth elements is only the first and some argue the easiest step.

In the original draft of the book I had three chapters on the rare earth elements.

Finally, I had wanted to try my hand at writing comedy, a rare element in science fiction.

"The prize then is not the rare elements, but rather the probe itself."

However, most rare earth elements are not found in concentrated or pure forms.