Shallow water blackout occurs when:
A) voluntary hypoventilation causes a drop in the PaO2.
B) cerebral vasodilation causes syncope during ascent.
C) a decreasing PaO2 during descent results in syncope.
D) a swimmer hyperventilates prior to entering the water.
Answer: D) a swimmer hyperventilates prior to entering the water.
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Which of the following statements characterizes most waterspouts?
A. They form in an area where winds are descending from a cloud. B. They have rotating winds of less than 45 knots. C. They draw water up into their core. D. They form in severe thunderstorms.
The city of New Orleans is located on this geologic feature:a
alluvial fan d. glacial drift b. sand dune e. delta c. barrier island
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A) Shallow marine bay B) Swamp C) Forest D) Eolian dunes
Water penetrating into soil promotes chemical weathering by acting as a weak ________
A) acid B) base C) saline solution D) neutral agent E) catalyst