The main reason you can walk barefoot on red-hot coals of wood without burning your feet involves
A. mind over matter techniques.
B. low conductivity of the coals.
C. low temperature of the coals.
D. all of the above
Answer: B
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The most abundant greenhouse gas in Earth's atmosphere is
A) water vapor (H2O) B) nitrous oxide (N2O) C) methane (CH4 ) D) carbon dioxide (CO2 )
A coarse-grained, shiny, foliated metamorphic rock that exhibits well developed mineral cleavage is classified as a
A) hornfels. B) slate. C) schist. D) phyllite.
When a strong magnet is brought near to a sample which is known to contain both iron and sulfur the iron and the sulfur are separated from one another. What type of material is this sample?
A) a compound B) a homogeneous mixture C) a heterogeneous mixture D) There is insufficient information to answer.
The presence of microscopic slush in water tends to make the water
A. more dense. B. less dense. C. warmer. D. slipperier.