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Rock History Crossword Puzzle

Chapter 4 L2 and L3 vocab
Across
The geological principle that states that in a horizontal rock, each layer is older than the layer above
Wildly distributed organisms that lived a long time ago
Igneous rock that forms when magma hardens
Absolute age tells scientists the number of years ago a rock layer formed.
Down
Radioactive parts break down releasing fast particles
The geologic age of a fossil organism, rock, or geologic feature or event defined relative to other organisms, rocks, or features or events rather than in terms of years.
A gap in the geological record that shows were rock layers are
relating to or denoting rock that has been extruded at the earth's surface as lava or other volcanic deposits.
the time taken for the radioactivity of a specified isotope to fall to half its original value.
(of a rock formation) be broken by a fault or faults.