Multiple Choice
Radiometric dating is based on
A) decay of uranium-238 to lead-206.
B) sequence of rocks and the relative position of one layer to another.
C) proportions of radioactive isotopes and their decay products.
D) the half-life of radioactive atoms.
Correct Answer:

Verified
Correct Answer:
Verified
Q31: The Permian extinction predominantly affected<br>A)reptiles.<br>B)marine life.<br>C)insects life.<br>D)terrestrial
Q32: During the Mesozoic,the supercontinent of Laurasia fragmented
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
Q37: Life forms in the Precambrian included<br>A)trilobites.<br>B)brachiopods.<br>C)coelacanths.<br>D)cyanobacteria.
Q38: Granitic pebbles with a radiometric age of
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