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How can you say definitively that other things are wrong? Shouldn't our physical relationship "progress" as other aspects of our relationship deepen? I understand most physical stuff is wrong, but what about just kissing? With respect to pre-marital, romantically oriented kissing, we're clearly talking about an area about which reasonable believers can (and do) disagree.

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This is done primarily by radiometric dating (or analysis of the breakdown of radioactive elements in the rocks over time).

The geologic time scale has been determined bit-by-bit over the years through relative dating, correlation, examination of fossils, and radiometric dating.

As shown in the image above of the Grand Canyon, each layer of rock needed to be studied, researched, identified, and named in order for geologists to devise the Geologic Time Chart. A) 2 million years old B) 3.96 million years old C) 3.96 billion years old D) No one is sure. A) Seasoning B) Scum C) Residue D) Layer 10) The oldest rock is how old? Click on the map labels or on the geologic time scale for details. Each chapter will include a few questions designed to test your knowledge of material covered in the chapter and in the Internet-based resources. Relative ages of important dates and creatures are also in millions of years before the present.