Multiple Choice
A rock formed with 1000 atoms of a radioactive parent element,but contains only 250 radioactive parent atoms today.If the half-life for the radioactive element is one million years,how old is the rock?
A) 250,000 years old
B) 750,000 years old
C) 2 million years old
D) 4 million years old
Correct Answer:
Verified
Correct Answer:
Verified
Q53: Major boundaries in the geologic time scale
Q54: Which of the following radioactive isotopes could
Q55: Carbon-14 has a half-life of approximately _
Q56: Almost nine-tenths of Earth's history occurs during
Q57: Both radiocarbon and potassium-argon dating share one
Q59: Which of the following statements is false?<br>A)Dikes
Q60: A disconformity is _<br>A)an erosional surface between
Q61: Repeated cycles of glaciations have taken place
Q62: What is considered the starting of the
Q63: When did the horizontal,layered sedimentary rocks in