The basic idea behind the planetesimal hypothesis is that
A) planets form as a direct result of the nuclear fusion of nebular gases and planetesimals.
B) small grains of cosmic dust and other solids gradual accrete to form planetesimals that may grow to become protoplanets and eventually planets.
C) early in the solar system's history, a star passed near to the Sun and pulled off gases that eventually condensed to form planets.
D) planets form from the remains of super-giant planetesimals that undergo nuclear fission and blow apart, thereby creating smaller objects—the planets.
B
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The overall rate at which humans are producing carbon dioxide is
A) increasing. B) decreasing. C) some years increasing and other years decreasing. D) remaining about the same.
Which of the following is the correct molecular formula for heptane?
A) C5H12 B) C6H14 C) C7H16 D) C8H18
Approximately 5 minutes following ascent from the water, a 30-year-old male diver complains of sharp chest pain and mild dyspnea. By the time you arrive at the scene, the patient is unresponsive. You should be MOST suspicious for:
A) nitrogen narcosis. B) a tension pneumothorax. C) decompression sickness. D) an arterial gas embolism.
Steel is in such demand that it is all readily recycled.
Answer the following statement true (T) or false (F)