Radon poses the greatest potential health risk to people when it is:
a. contained in insulation material used in residential properties during the 1970s
b. found in high concentrations in unimproved land
c. trapped and concentrated in inadequately ventilated areas
d. emitted by malfunctioning or inadequately ventilated appliances
Answer: c. trapped and concentrated in inadequately ventilated areas
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A bat’s wing and a bird’s wing are examples of analogous organs. Indicate whether the statement is true or false
Looking at Figure 10.2.8, which of the following countries get the highest percentage of their protein from meat?
A) South Africa B) India C) Russia D) China E) Egypt
Finely laminated, alternating light and dark layers of sediment deposited in a glacial lake are known as
glacial ____________________. Fill in the blank(s) with the appropriate word(s).
Placers are sedimentary deposits where valuable minerals have been hydraulically sorted. Which of the following mineral properties are required for hydraulic sorting by streams to be effective?
A. high solubility and high density B. small grain size and well-rounded shape C. large grain size and high solubility D. high density and high chemical resistance E. well-rounded shaped and high chemical resistance