The headwater flow of a mountain stream is generally characterized as
A) laminar.
B) turbulent.
C) meandering.
D) all of these
Answer: B
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Which of the following statements best describes the idea behind the Labeled Release Experiment on board the Viking landers?
A) living organisms in the soil should give off gases when they metabolize nutrients B) soil with living organisms in it should contain organic molecules C) living organisms in the soil should incorporate carbon from atmospheric gases D) radioactive gases should be produced when radioactive nutrients are added to a soil sample
Once oxygen started to be manufactured by cyanobacteria, why did it take so long to build up to significant levels?
A) initially most of the oxygen escaped into space B) oxidation of surface rock and ocean minerals occurred C) initially most of the oxygen produced dissolved in the oceans D) initially most of the oxygen was converted into water by reaction with hydrogen
High-speed stroboscopic photographs show that the head of a golf club of mass 200 grams is traveling at 55.0 m/s just before it strikes a 46.0-gram golf ball at rest on a tee. After the collision, the clubhead travels (in the same direction) at 40.0 m/s. Find the speed of the golf ball just after impact
The energy emitted by the Sun comes from chemical reactions
a. True b. False Indicate whether the statement is true or false