Which value for the mantle is not higher than water's value?
A) density
B) viscosity
C) melting temperature
D) rate of flow
Answer: D
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Grasses and fast-growing trees like poplars are planted on _____________ plantations to provide fuel for power plants.
Fill in the blank(s) with the appropriate word(s).
Which of the following best describes soil?
A) Soil is composed of solely mineral fragments less than 2 mm in size. B) Soil lacks biological material. C) Soil is a renewable resource. D) Soil is a dynamic natural material composed of water, air, mineral fragments, and organic matter.
Black smokers emit water in excess of 350 degrees Celsius, but release water rather than steam. Why is this so? (Water normally turns to steam at 100 degrees Celsius)
a) The water surrounding the smokers cools down the emitted water b) The boiling point of water is much higher where black smokers occur due to higher pressure c) The benthic life associated with black smokers prohibits the water from vaporizing d) None of the above
The image below shows a beam of radiation passing between two electrically charged plates. 
Which of the beams is actually composed of particles?
A. a B. b C. c D. a and c E. all of the above