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History Of Earth Crossword

Across
What is a result in deformation due to plate tectonics?
What is a break in Earth's crust named?
What material helped determine Earth's approximate age?
A type of rock formed by other remains of other rocks,plants, and animals?
Down
What is the time it takes for half of the radioactive atoms to decay called?
What are preserved traces of living things?
What type of fossils are widely distributed during a short geological period of time?
What is a type of change that results in the formation of chemical substances?
What is it called when magma cools on the inside of igneous rock?
What is the Earth partly made up of?