What element is the fuel for main-sequence stars?
What will be an ideal response?
Hydrogen.
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The force of gravity does work on a bowling ball when it rolls
A. on a sloped surface. B. along a horizontal surface. C. both of these D. none of the above
The theory of seafloor spreading is supported by
A. paleomagnetic analysis of the ocean's floor. B. geological, biological, and climatological data. C. the change in Earth's polarity. D. none of the above
A surface map
A) shows the topography of the land under which weather is happening. B) depicts the general prevailing weather conditions over an area. C) has height contour lines that show wind flow. D) is only used by the television media to lend credibility to their own forecasts.
Vitamin A deficiencies are associated with
A. Blindness B. Poorly developed neural systems in embryos C. Weak bones D. A lack of energy, or listlessness E. Anemia