Which of the following objects do you expect to find at the center of a planetary nebula?
A. planet
B. black hole
C. white dwarf
D. neutron star
Answer: C
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The main pollutant released by coal burning is
A. Sulfur oxides B. Mercury vapor C. Methane D. Volatile organic compounds E. NOx
When contamination enters groundwater, it moves along with the direction of the groundwater. The contamination takes on a particular shape called a
A. horizontal fissure. B. cone of contamination. C. plume.
Why would it be difficult to land a spacecraft on Jupiter?
A. Jupiter's intense magnetic field would destroy it. B. The clouds are so thick it would be hard to navigate to a safe spot. C. Jupiter's immense gravity would squash it. D. Jupiter has no solid surface.
At its poleward margin the ________ climate is bounded by the 0° Celsius isotherm of average annual temperature
A) Dfa B) Dwa C) ET D) EF E) BW