The _____ Ended with the Greatest Mass Extinction Ever to Occur

Q49: The principle of superposition states that within

Q50: Carbon-14 is created in the atmosphere by

Q51: Geologists use fossils in sedimentary rocks to

Q52: The principle of _ allows rock layers

Q53: In a(n) _ the erosional contact represents

Q54: The _ of a radioactive material is

Q56: The carbon-14 isotope disintegrates radioactively with a

Q57: The truncation of bedding where sedimentary rock

Q58: The proportional amount of atoms that decay

Q59: Uranium-238 ultimately decays to _ -206.<br>A) lead<br>B)