A lahar is produced when

A) ash is blown out of a vent and onto the side of the volcano
B) ash and other pyroclastic ejecta become saturated with water
C) a lateral blast spreads ash across a large area
D) a lava flow breaks apart on the steep portion of a composite cone


B

Environmental & Atmospheric Sciences

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Which of the following buffers will have the highest pH?

A) a solution containing 0.20 M HC2H3O2 and 0.20 M NaC2H3O2 B) a solution containing 0.25 M HC2H3O2 and 0.15 M NaC2H3O2 C) a solution containing 0.15 M HC2H3O2 and 0.25 M NaC2H3O2 D) They all have the same pH.

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Oxygen (O2) is being added to the atmosphere by ________

A) solar radiation B) animal decomposition C) meteorites D) vegetation E) the burning of coal

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Many regions of Micronesia and Polynesia are highly dependent upon what form of income?

A) light manufacturing B) tourism C) fishing D) mining E) farming

Environmental & Atmospheric Sciences