nyenye Flashcards

1
Q

million of years

A

age

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2
Q

tens of millions of years

A

epoch

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3
Q

one hundred million years

A

period

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4
Q

half a billion of years or more

A

era

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5
Q

the largest time span of the geologic time scale (one billion years or more)

A

eon

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6
Q
  • k-40 half-life 1.3 billion years
  • decays into argon and calcium
  • used to date rocks older than 100,000 years old
A

potassium-argon method

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7
Q
  • U-238 half life 4.5 billion years
  • decays into lead-206
  • used for rocks more than 10 million years old
A

uranium lead method

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8
Q
  • Rb-87 half life 49 billion years
  • Decays into strontium-87
  • used for rocks more than 10 million years old
A

rodinium strontium method

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9
Q

organism that recently died

A

carbon 14 method

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