Identify the true statement.Group of answer choicesRadiometric dating can be used only if some uranium is present in a rock.Dating a sand grain in a sandstone gives the age of the sandstone's formation.Dating a mineral within a metamorphic rock gives the age when the rock cooled below the closure temperatures of that mineral.All of the possible answers are correct.
Question
Identify the true statement.Group of answer choicesRadiometric dating can be used only if some uranium is present in a rock.Dating a sand grain in a sandstone gives the age of the sandstone's formation.Dating a mineral within a metamorphic rock gives the age when the rock cooled below the closure temperatures of that mineral.All of the possible answers are correct.
Solution
The true statement is: "Dating a mineral within a metamorphic rock gives the age when the rock cooled below the closure temperatures of that mineral."
This is because radiometric dating can be used with various elements, not just uranium. Also, dating a sand grain in a sandstone does not necessarily give the age of the sandstone's formation, as the sand grain could have existed long before it became part of the sandstone. However, dating a mineral within a metamorphic rock can provide the age when the rock cooled below the closure temperatures of that mineral, as this is when the mineral's "radiometric clock" starts.
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