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When the Soviet Union denied the United States, Britain, and France access to Berlin in 1948, President Truman responded by
Oldest Rock
The earliest forms of solid rock on Earth, providing evidence of the planet's geological history and surface conditions.
Billion Years
A time scale used in geology and astronomy to describe events or processes that happened a billion years ago or the age of geological formations.
Isotopic Age
The determination of the age of a mineral, rock, or geologic event based on the ratio of parent isotopes to daughter isotopes within a given system.
Geologic Timescale
A dating system used chronologically by geologists and other scientists to detail the timing and relationships of historical events on Earth.
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