In general, the healthiest soil texture for plants is one in which
A) sand dominates, clays are next highest in concentration, and silt has the smallest concentration.
B) clay dominates, sands are next highest in concentration, and silt has the smallest concentration.
C) sand dominates, silts are next highest in concentration, and clay has the smallest concentration.
D) there is a relatively even percentage of sand, silt, and clay.
D) there is a relatively even percentage of sand, silt, and clay.
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The ________ forms the relatively cool, brittle plates of plate tectonics.
Fill in the blank(s) with correct word
In the year 2006, the U.S. consumed approximately one billion tons of coal. Each ton of coal produces 20 GJ (gigajoules of energy). How much energy was actually put to work?
A. 16% B. 59% C. 84% D. 29%
Which of the following temperature combinations are correct for the freezing point of water, room temperature, and the boiling point of water?
A) 32°, 77°, 273 B) 0°, 77°, 373 C) 32°, 298°, 373 D) 273, 298, 373
What did the Cassini spacecraft and its Huygens probe discover on the surface of Titan, the largest of Saturn's moons?
A. Networks of drainages were apparently carved by liquids. B. The surface was nearly completely covered by impact craters. C. There was a large impact crater that nearly blasted the moon apart. D. None of these choices are correct.