When evaporation occurs in a dish of water, the molecules remaining in the water
A) are less energetic.
B) have decreased average speeds.
C) are at a lower temperature.
D) all of the above
Answer: D
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Suppose our Sun were suddenly replaced by a supergiant star. Which of the following would be true?
A) Earth would be inside the supergiant. B) The supergiant's surface temperature would be much hotter than the surface temperature of our Sun. C) Earth would fly off into interstellar space. D) The supergiant would appear as large as the full Moon in our sky.
A sievert is how many rem?
A. 1 B. 0.01 c. 100 D. 1000
Determine the number of air masses through which the sun’s rays must pass to reach the earth at the equator and at the equinox.
What will be an ideal response?
In 2014, when scientists used a laser to simulate the conditions generated when a large impact hits a mixture of prebiotic molecules, they were able to produce
A) all 20 amino acids used in life B) all four DNA bases used in life C) complex carbohydrates D) simple proteins