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The diesel fuel's antiknock quality is measured by the cetane rating.
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.
Mineral Grains
individual particles or crystals within a rock, defining its texture and often determining its properties and classification.
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