Swelling soils are typically due to ____
a. ?kaolinite clay expelling, water which increases the volume of sand layers
b. ?heat, which increases the volume of water bound in clay layers
c. ?freezing water, which expands, increasing the volume of clay layers
d. ?smectite clay increasing in volume as it absorbs water
e. ?landslides removing pressure from clay layers, allowing them to increase in volume
ANSWER: d
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The United Nations Millennium Development Goals (MDG) are based on
A) capitalist ideology. B) socialist principles. C) Malthusian theory. D) population policy. E) vital records.
Unpolluted freshwater supplies
A. typically require treatment before being delivered to homes. B. are available to most of the people of the world. C. are primarily provided by groundwater. D. are becoming more common as sources of pollution are eliminated.
When did Pangea begin to split apart?
A) 60 million years ago B) 180 million years ago C) 240 million years ago D) 360 million years ago
Independent of the actual salinity, the ratios or proportions of the major dissolved constituents of seawater such as chloride, sodium, and magnesium are relatively constant. (T/F)
a. true b. false