What is NOT a primary consideration in establishing fire risk for an area?
a. temperature
b. vegetation
c. the amount of available firefighting resources
d. topography
e. weather patterns
ANSWER: c
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How many half-lives would have occurred if radioactive decay began with 180,000 parent atoms of an isotope but had only 17,500 left?
- One
- Two
- Three
- Four
Acid mine drainage occurs when ____.
A. mines use acid to clean equipment B. acid is used to remove rare earth minerals from mines C. acid is used to detect low grade mineral ores D. naturally occurring acids are uncovered during the mining process E. rainwater seeps through an underground mine spoils pile and produces sulfuric acid
A landscape hazard is best reduced when ____ of the slope
a. ?mass is added at the head and water drained from the toe b. ?mass is added at the head and water injected in the toe c. ?mass is removed from the toe d. ?water is removed at the head e. ?mass is added at the toe and water drained from the toe
Generally, the ____ the air when the snow fell, the richer the concentration of oxygen-16 in an ice core
a. ?wetter b. ?warmer c. ?colder d. ?drier e. ?denser