The planet consisted of rock and magma with a metal core.

And all the while the planet's metal core grew with incredible intensity.

Soil samples are often taken using a metal core.

I don't care much for his theory of launching the fuel balloons with a metal core.

A door opened immediately near the fore end of the metal core.

The metal core did not shatter as it stretched toward him across the sky.

In the center of the fourth film, the lights outlined a dark disc, a metal core.

He was handling the bomb with great care, extracting the heavy metal core.

"So they can't get the metal core of the planet."

The car companies reacted quickly when the plastics industry learned how to mold parts around a metal core.