Phytoplanktonic organisms with skeletons made of silica are called ____________________. Fill in the blank(s) with the appropriate word(s)
diatoms
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The "Velvet Divorce" separated
A. East Germany from West Germany B. France from Belgium C. The Czech Republic from Slovakia D. Croatia from Serbia
Smelter emissions often cause what type of adverse environmental degradation?
A) acid mine drainage B) acid rain C) asbestos deposition D) global warming
During a cold winter, snow can provide a useful shelter material for animals and humans because it is a poor ________
Fill in the blank(s) with correct word
Which of the following best describes how geysers erupt?
A) Water below the water table slowly boils in a vertical crack or natural conduit, causing a plume of condensed water vapor to rise above the vent. B) Water slowly boils in a network of vertical cracks above the water table, sending up a plume of steam and hot water. C) Water suddenly boils in disconnected voids and cracks above the water table, causing the aquifer to explosively fragment. D) With a slight reduction in pressure, water in a saturated, natural conduit suddenly boils, sending a plume of steam and hot water into the air above the vent.