How do we know that the 14C radioactive dating method is valid for dating archaeological and geological materials?
What will be an ideal response?
When the 14C method is used to determine the age of materials of known age, the 14C age is identical to the known age within experimental uncertainties.
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Electric charge flows in an electric circuit when
A. the circuit is grounded. B. electric resistance is low. C. a potential difference exists. D. electric devices in the circuit are not defective.
It is estimated that over ________ of U.S. export revenues comes from service exports
A) 1/10 B) 1/5 C) 1/3 D) 1/2 E) 3/4
Which of the following features characterize wide streams and valleys?
A) rapids; channel bed potholes B) V-shaped valley cross-sections C) natural levees; broad floodplains D) waterfalls; entrenched meanders
One way to reduce the effects of acid rain is to remove lead from fuels.
Answer the following statement true (T) or false (F)