Which of the following isotopes are commonly used for radiometric dating check all that apply

The only problem with this theory is that recently investigators have discovered fairly extensive deposits of very well preserved animal droppings associated with grasses as well as human-produced artifacts like arrowheads and the like. For instance, carbon has a half-life of 5, years. Jelsma; P.

Argon is a gas and the atoms of 40 Ar remain embedded within the crystal, unless the rock is subjected to high temperatures after it forms.