_______ Is the Spontaneous Nuclear Change of Isotopes with Unstable

Q9: _ are subdivisions of eras.<br>A) Ages<br>B) Intervals<br>C)

Q10: A(n) _ fossil is a fossil from

Q11: _ denotes the vast amount of time

Q12: The _ Era is the Age of

Q13: So far, the oldest mineral found on

Q15: The _ includes most of geologic time

Q16: Isotopic dates from volcanic ash or lava

Q17: Uniformitarianism reflects the belief among geologists that

Q18: Isotopic dating has shown that the Precambrian

Q19: A(n) _ is a contact in which