A uranium-lead age determined from a zircon crystal removed from a sandstone would reflect the time elapsed since the ________ of the zircon.
A) erosion
B) deposition
C) crystallization
D) cementation
Question 2
In order to use a radioactive-decay scheme to calculate the age of a mineral all of the following conditions must be met except
A) the half-life must be known.
B) no daughter isotope present prior to the start of parental decay or the amount of daughter can be determined.
C) no parent or daughter isotopes can be gained or lost from the mineral once decay starts.
D) only one radioactive isotope can exist in the rock so that cross-decay doesn't occur.
The Geologic Time Scale
Attention and memory are in demand during circle time.
Tag identify that the power has been removed and service work is being done.
The tertiary of a transfer RNA as determined by X-Ray diffraction
Average real hourly wages (2010 dollars) by education level, full-time workers aged 17 to 34 in 2011
Time-of-entry mapping