Old Rocks, Young Rocks

The layers tell us when the rock was made. The lower layers of rock are older.

This rock in Utah formed many years ago.

This rock in Utah formed many years ago.

Photograph showing numerous layers of rock in a mountain
Lower layers of rock are older than higher layers of rock.

Lower layers of rock are older than higher layers of rock.

Young Rock

Old Rock

In Other Words

  • lower layers layers on the bottom