What is the threshold mortality rate (the number of test organisms that die as a result of exposure to a potential pollutant) that determines if a pollutant is toxic or not?
Answer: 50%
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A cloud type formed by strong convection currents is:
a. cirrus. b. lenticular. c. stratus. d. cumulonimbus.
Biodiversity is fundamental to human welfare and economic development and plays a critical role in meeting human needs by maintaining the ecological processes upon which our survival depends.
Answer the following statement true (T) or false (F)
Which of the following moisture variables describes the actual amount of moisture in the air?
A) dewpoint temperature, relative humidity, and vapor pressure B) vapor pressure, saturation vapor pressure, and dewpoint temperature C) absolute humidity, relative humidity, and dewpoint temperature D) saturation vapor pressure, relative humidity, and dewpoint temperature E) vapor pressure, dewpoint temperature, and mixing ratio
The Surface Mining Control and Reclamation Act of 1977
A. stipulates the mining methods to be used. B. applies to all surface mines on federal lands. C. requires restoration of mined land to its premising condition, insofar as possible. D. All of the choices are correct.