The oldest continental crustal rocks on Earth are between 3.7 to 4.28 billion years old.

Most crustal rocks formed before 2.5 billion years ago are in cratons.

Gradually during millions of years, crustal rocks were folded and fractured and the seas driven away.

Rocks on the island are mainly lower crustal metamorphic rocks.

There's deep, deep layers of stratified matter before you get to impervious crustal rock.

These minerals are common in crustal rocks such as granite.

"You say he had cut a specimen from a fragment of crustal rock," Admiral Lightner said.

Partial melting is an important consideration in geology with respect to the chemical differentiation of crustal rocks.

That Heighliner never passed through the crustal rock of Ix at all.

The crustal rocks of its planetary body snapped and white-hot magma spewed forth.