A star has a parallax of 0.04 arc seconds. What is its distance?
A. 25 light-years
B. 4 parsecs
C. 4 light-years
D. 25 parsecs
Answer: D
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In the geology, the term "Precambrian" refers to
A) the eon immediately preceding the Phanerozoic eon B) all eons preceding the Phanerozoic eon C) the eon immediately preceding the Proterozoic eon D) all eons preceding the Proterozoic eon
Which of the following is an example of convection?
A) different kinds of material separating by density, like oil and water B) rocks sinking in water C) warm air expanding and rising while cooler air contracts and falls D) gas bubbling upward through a liquid
Two objects made from the same material have different masses and different initial temperatures as shown. If the bodies are placed in thermal contact, the final equilibrium temperature is most nearly:
An electric current produces
A) a gravitational field. B) an electric field. C) a magnetic field. D) an electromagnetic field. E) a universal field.