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
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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
Which one of the following is a sedimentary rock?
A) limestone B) rhyolite C) slate D) quartz
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.
Oxygen (O2) is being added to the atmosphere by ________
A) solar radiation B) animal decomposition C) meteorites D) vegetation E) the burning of coal