Question

Earth's Formation Quick Check
1 of 51 of 5 Items
Question
Which allowed scientists to determine that Earth was at least 4.3 billion years old?(1 point)
Responses

the electrical conductivity of uranium ions
the electrical conductivity of uranium ions

chemical reactivity of zircon ions
chemical reactivity of zircon ions

magnetic field surrounding zircon
magnetic field surrounding zircon

the radioactive decay of uranium to lead

Answer 1

the radioactive decay of uranium to lead