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Measurement of radioactive elements in rocks:
4.6 billion years old
dinosaur extinction
about 440 million years ago
hundreds of millions of years
provides the absolute age of the rock
the time required for one-half of a given quantity of the element to decay
tens of millions of years
billions of years
We learn, in Geology, that which of the following comes first?
4.6 billion years old
dinosaur extinction
about 440 million years ago
hundreds of millions of years
provides the absolute age of the rock
the time required for one-half of a given quantity of the element to decay
tens of millions of years
billions of years
What is the half-life of a radioactive element?
4.6 billion years old
dinosaur extinction
about 440 million years ago
hundreds of millions of years
provides the absolute age of the rock
the time required for one-half of a given quantity of the element to decay
tens of millions of years
billions of years
Eras are chunks of time that last:
4.6 billion years old
dinosaur extinction
about 440 million years ago
hundreds of millions of years
provides the absolute age of the rock
the time required for one-half of a given quantity of the element to decay
tens of millions of years
billions of years
Geologists have recently determined that Earth is approximately (or about):
4.6 billion years old
dinosaur extinction
about 440 million years ago
hundreds of millions of years
provides the absolute age of the rock
the time required for one-half of a given quantity of the element to decay
tens of millions of years
billions of years
Eons are chunks of time that last:
4.6 billion years old
dinosaur extinction
about 440 million years ago
hundreds of millions of years
provides the absolute age of the rock
the time required for one-half of a given quantity of the element to decay
tens of millions of years
billions of years
Periods are chunks of time that last:
4.6 billion years old
dinosaur extinction
about 440 million years ago
hundreds of millions of years
provides the absolute age of the rock
the time required for one-half of a given quantity of the element to decay
tens of millions of years
billions of years
When did plants first colonize land?
4.6 billion years old
dinosaur extinction
about 440 million years ago
hundreds of millions of years
provides the absolute age of the rock
the time required for one-half of a given quantity of the element to decay
tens of millions of years
billions of years
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