Introduction -- Page 3 of 12

5.	Because of interaction and exchange with atmosphere and oceans, all living tissue maintains a fixed proportion of C-14. After death, the amount of C-14 begins to decrease.
	True
	False
6.	A C-14 date estimates the time since the death of once-living things, up to about 50,000 years. Which of the following materials CANNOT be dated by this method?
	bones
	wood
	soil
	pottery with imbedded charcoal
	volcanic ash from Pompei