1. relating to or forming the earth’s crust
Usage: geological
2. relating to or forming a crust or hard outer layer

Examples

• The earthquake was caused by crustal movement along the fault line.
• Scientists study crustal rocks to understand Earth’s history.
• Crustal plates shift slowly over millions of years.
• The crustal layer of the bread was perfectly golden.
• Crustal deformation occurs during mountain building.
• The crustal thickness varies between continents and oceans.