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Science Crossword

Student: Logan Esser
Across
The time it takes the half of life of an atom to decay
To determine the age of sedimentary rock layers
Its age compared to the age of other rocks
A widely distributed fossil that geologists use to figure out the age of other rocks
Lava that hardens on the surface and forms igneous rock
Down
Is a break in the earths surface of crust
The number of years that have passed since the formation of the rock
Is a gap in geologic record
Elements that release particles and energy in this process
Magma cools and hardens to form a mass of igneous rock