Earth History Crossword Puzzle

An assortment of vocabulary words pertaining to the geologic history of Earth

Word Bank
Absolute Age, Climate Change, Cross cutting Relationships, Fossil, Fossil Fuels, Geologic Time scale, Half Life, Ice Core, Igneous Intrusion, Index Fossil, Original remains, Radiometric Dating, Relative Age, Superposition, Uniformitarianism

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Across

3. The process of determining the age of rocks from the decay of their radioactive elements. (2 Words)

6. Summary of Earth’s history divided into intervals of time defined by major events or changes on Earth (3 Words)

7. A trace or remains of a once-living thing from long ago

9. A change in global or regional climate patterns (2 Words)

10. The forcing of molten rock into an earlier formation. (2 Words)

11. A fossil of an organism that was common, lived in many areas, and existed only during a certain period of time (2 Words)

12. Processes shaping Earth today also shaped Earth in the past

13. In any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom.

14. The length of time it takes for half of the atoms in a sample of a radioactive element to change from an unstable form into another form (2 Words)

15. The actual age in years of an event or object (2 Words)

Down

1. These are formed from the remains of prehistoric organisms that are burned for energy (2 Words)

2. An igneous intrusion is always younger than the rock it cuts across. (3 Words)

4. A tubular sample that shows the layers of snow and ice that have built up over the years. (2 Words)

5. The age of an event or object in relation to other events or objects (2 Words)

8. A fossil that is the actual body or body parts of an organism (2 Words)

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