Which of the following nuclear equations correctly describes alpha emission?
A. 
U ? 
He
B.
 U ?  Pu | +  He |
C.
U ? 
Th + 
HeD.
U ? 
U + 
HeE. none of the above
Answer: C
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Deep, hot pore waters containing geopressurized natural gas may themselves be a source of heat energy.
Answer the following statement true (T) or false (F)
Which of the following is/are subcycles within the geologic cycle?
A) hydrologic cycle only B) the rock cycle only C) the tectonic cycle only D) the rock cycle, tectonic cycle, and hydrologic cycle E) the rock cycle and the tectonic cycle
A confined aquifer is defined as
a. an aquifer that traps porous rocks between layers of less permeable substrate. b. an aquifer that traps porous rocks under one layer of less permeable substrate. c. an aquifer with porous rocks resting on bedrock. d. an aquifer with no upper layer.
The term half-life represents the time it takes
A) to dissolve half of the atoms in the lattice. B) for the parent atoms to decay into atoms half their original size. C) for half of the parent atoms to decay into daughter atoms. D) for the Sun to decrease its size by 50 percent.