Multiple Choice
Granitic pebbles with a radiometric age of 300 million years are embedded in a sedimentary rock.A dike,dated at 200 million years,intrudes into the sedimentary rock.With all this information we can estimate the age of the sedimentary rock to be
A) older than 300 million years.
B) younger than 200 million years.
C) between 200 and 300 million years old.
D) precisely 300 million years old.
Correct Answer:

Verified
Correct Answer:
Verified
Q33: The iridium layer at the Cretaceous-Tertiary boundary
Q34: Radiometric dating assumes that,once a mineral has
Q35: During the Mesozoic,the supercontinent of Gondwanaland fragmented
Q36: Radiometric dating is based on<br>A)decay of uranium-238
Q37: Life forms in the Precambrian included<br>A)trilobites.<br>B)brachiopods.<br>C)coelacanths.<br>D)cyanobacteria.
Q39: What is the most widely accepted hypothesis
Q40: The oldest known fossils are<br>A)trilobites and brachiopods.<br>B)algae
Q41: According to most estimates,Earth is approximately<br>A)4.5 thousand
Q42: In a sequence of rock layers we
Q43: The break-up of Pangaea had worldwide consequences-how