Which of the following statements best describes the idea behind the Gas Exchange Experiment on board the Viking landers?
A) radioactive gases should be produced when radioactive nutrients are added to a soil sample
B) living organisms in the soil should give off gases when they metabolize nutrients
C) soil with living organisms in it should contain organic molecules
D) living organisms in the soil should incorporate carbon from atmospheric gases
B
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For metals and ceramics to be superplastic, they must have a high ___________hardening rate.
Fill in the blank(s) with the appropriate word(s).
What would happen to Earth's temperature if Earth were more reflective?
a. It would go up. b. It would go down. c. It wouldn’t change.
A 26.0-N crate starting at rest slides down a rough 4.8-m-long ramp, inclined at 21.0° with the horizontal. 18 J of energy is lost to friction. What will be the speed of the crate at the bottom of the incline?
a. 27.1 m/s b. 5.81 m/s c. 6.36 m/s d. 4.49 m/s
Equal charges are located at the vertices of a 3-4-5 triangle. The charge experiencing the largest force is located at
A) the 90° vertex. B) the 37° vertex. C) a vertex that depends on the size of the charges. D) the 53° vertex. E) cannot be determined.