What conditions are necessary for a total solar eclipse?
A) new moon on ecliptic near perigee
B) full moon on ecliptic near aphelion
C) new moon on equator at perigee
D) full moon on equator at perigee
E) new moon on ecliptic near aphelion
A
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In general, what happens to the density and temperature of a gas as it expands?
A) It gets less dense and cooler. B) It gets denser and cooler. C) It gets less dense and hotter. D) It gets denser and hotter.
Mercury, the closest planet to the Sun, has an orbital period that is
1.greater than that of all of the other planets. 2.less than that of all of the other planets. 3.greater than that of some of the planets and less than that of others. 4.equal to one Earth year.
A dike that intrudes a bed of sedimentary rock is ______________ than the sedimentary rock
Fill in the blank(s) with correct word
Which experiences the least electrical force in an electric field?
A) alpha particle B) beta particle C) electron D) gamma ray E) all the same