Question 4 of 20
4 Points
A radioactive element has a half-life of 3,000 years. If a sample of this
element begins with a mass of 60 grams, how long would you have to wait for
the mass to decrease to 15 grams?
O
A. 6,000 years
O
B. 12,000 years
O
O
C. 3,000 years
D. 1,500 years
BH

What's a recharge area? a. the part of an aquifer where groundwater meets a lake or stream b. the part of an aquifer where surface water reaches the water table c. the part of an aquifer that's located between two aquicludes d. the part of an aquifer that's located at a lower elevation