Coal is generally classified in four categories. Which type is the most widely used?
A. anthracite
B. bituminous
C. lignite
D. subbituminous
Answer: B
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Which of the following provides the minimum amount of protection you need to block the following form of radiation?gamma
A. lead suit B. suntan lotion C. thick leather D. T-shirt E. none of the above
Maternal mortality ratio is the number of women who die giving birth per ________ births
A) 1000 B) 10,000 C) 100,000 D) 1,000,000 E) none of the answer choices are correct.
Phytoplankton blooms can occur when the following are present in abundance except ________.
A. light B. carbon dioxide C. zooplankton D. nitrate E. phosphate
Why has our production of food increased over the past 50 years despite the growing population?
a. We have become more sustainable in food production. b. We have doubled the land used for agricultural production. c. Technology in the form of fossil fuels, pesticides, and fertilizers has increased production. d. We have not produced more food in the past several decades.