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History Of Earth Crossword

By. Brady Walton
Across
The ____ of a rock is the number of years that have passed since the rock formed.
Lava that hardens on the surface and forms igneous rock is called _____.
The ____ of a radioactive element is the time it takes for half an atom to decay.
Geologists use _____ to determine the realative age of sedimentary rocks.
An ____ is a gap in geologic record.
Down
A ____ is a break in Earth's crust.
The ____ of a rock is its age compared to the ages of other rock.
A fossil that is widely distributed is called ____.
These elements release particles and energy in a process called ______.
The magma cools and hardens into a mass of igneous rock is called ___.