Regents Prep: Earth Science
Multiple-Choice Questions
  Question 2 of 10   Earth History
This question may require the use of the Earth Science Reference Tables.

The absolute age of a rock is the approximate number of years ago that the rock formed. The absolute age of an igneous rock can best be determined by


 1.  comparing the amounts of decayed and undecayed radioactive isotopes in the rock

 2.  comparing the sizes of the crystals found in the upper and lower parts of the rock

 3.  examining the rock’s relative position in a rock outcrop

 4.  examining the environment in which the rock is found

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