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If students choose to write these exams, results will count for 40 percent of the final course mark.
Some very straightforward principles are used to determine the age of fossils.
Students should be able to understand the principles and have that as a background so that age determinations by paleontologists and geologists don't seem like black magic. Geologists in the late 18th and early 19th century studied rock layers and the fossils in them to determine relative age.
Optional exams will be offered in sixteen Grade 12 courses (the same as the existing set of exams).
Students, not their school, make the choice to write Optional exams.
The second type of age dating is called absolute age dating .