Which is the effect of lower prices for a mineral commodity?
A. It encourages less waste of the resource.
B. It spurs exploration for new deposits.
C. It convinces buyers to use less.
D. It encourages exploitation of lower grade deposits.
Answer: A
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The half life of Uranium-238 is 4.5 billion years. Approximately how much of the radioactive Uranium-238 parent isotope is left in a rock that is 4 billion years old?
- 25%
- 45%
- 55%
- 75%
____________________ refers to the relationship between distances on Earth to distances on the map
Fill in the blank(s) with correct word
What happens to a river as it flows through a delta and encounters the sea? 
A. The maximum sediment grain size carried by the river increases. B. The total sediment load carried by the river decreases. C. The discharge and water velocity increase. D. All of these choices are correct.
Why is the sea level dropping in certain places like Scandinavia?
A. postglacial rebound B. sediment deposition C. shoreline erosion D. global warming