71. All oil traps contain
72. The geographical pattern of average air temperature near sea level is _______ homogeneous in the southern hemisphere as compared to the northern hemisphere.
73. In the northern hemisphere, north-facing hillsides have a _______ growing season than south-facing hillsides.
74. The dew point temperature is a measure of the total amount of water vapor in the air.
75. The horizontal extent of the ozone hole can sometimes exceed the size of the Antarctic continent.
76. Heat waves are generally considered to be little more than a nuisance and are not responsible for considerable loss of life.
77. Fog is a major hazard to aviation.
78. Suppose two unsaturated air masses mix horizontally. The resulting mixture cannot possibly be saturated.
79. Carbon dioxide is a naturally-occurring component of the atmosphere.
80. To protect fruit trees from frost, it is important to keep the air as still as possible.
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