Examlex
The first European to make systematic observations of the heavens by telescope was
Time Equivalency
The concept of dating geological layers or events as being the same age based on the evidence of similar rocks, fossils, or geologic features.
Geology
A field of study focused on understanding the Earth's physical makeup, its history, and the natural processes that influence its structure and composition.
Isotopic Ages
Measures the time elapsed since a particular mineral or rock formed, based on the decay rates of radioactive isotopes.
Billion Years
A period of time equal to 1,000 million years, often used in geological and astronomical contexts to describe the age of Earth or the universe.
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