Which of the following statements describes why particulates with a diameter of less than 2.5 micrometres are particularly dangerous?
A. They are chemically neutralized by dissolved carbon dioxide.
B. They absorb ultraviolet radiations effectively.
C. They dissolve easily in water.
D. They can penetrate deep into the lungs.
Answer: D
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A. Stage 1 B. Stage 2 C. Stage 3 D. Stage 4
Over a period of time, a slowly crystallizing magma liquid develops a higher silica content while magnesium abundance decreases through fractional crystallization
Do the minerals crystallizing from the magma contain more silica relative to the starting magma or do they contain more magnesium relative to the starting magma? a) The minerals contain more Si than the magma liquid b) The minerals contain more Mg than the magma liquid
The Kyoto Protocol was ratified by 130 countries in 2004 and became international law in 2005. What is the goal of the Kyoto protocol?
A) reduction of emissions from scrubbers used in industrial plants B) reduction of chlorofluorocarbon emissions C) reduction of greenhouse gas emissions D) reduction of air pollutants from nuclear power plants E) reduction of emissions of nitrous oxide to control acid rain
Which of the following is the common name of 2-methyl-2-propanol?
A) sec-butyl alcohol B) tert-butyl alcohol C) isobutyl alcohol D) isopropyl alcohol