At the time of a solar eclipse, the Moon is in ______________ phase
Fill in the blank(s) with correct word
full
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Which group is the nearest neighbor to the noble gases in the periodic table?
a. Noble gases b. Alkaline earth metals c. Halogens d. Alkali metals
Uranus and Neptune appear blue or blue-green because
a. their atmospheres absorb blue light very efficiently. b. their solid air-less surfaces are this color c. their surfaces are covered with liquid water with no atmosphere d. traces of methane in their atmospheres absorb red light very efficiently.
How do high-mass stars make it more difficult for a molecular cloud to form more stars?
A) Strong winds push gas away. B) Ultraviolet photons ionize the gas. C) Ultraviolet photons heat the gas. D) Radiation pressure pushes ionized gas away. E) All of the above
A feature of the quantum model of the atom that is not a feature of the Greek or planetary models is that
A) the quantum model is only a theory, whereas the other two models are supported by factual evidence. B) the quantum model of the atom cannot be visualized. C) Both of the above. D) the quantum model can explain electrical effects. E) All of the above.