If the Moon is relatively far from Earth, so that its umbra does not reach Earth, someone directly behind the umbra will see
A) a penumbral lunar eclipse.
B) a partial solar eclipse.
C) no eclipse.
D) an annular eclipse.
E) a partial lunar eclipse.
D
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Life forms became large and complex during the ______________ period
Fill in the blank(s) with correct word
Stars on the main sequence have different luminosities because
A. they have different apparent magnitudes. B. they have different ages. C. they have different chemical compositions. D. they have different masses. E. they are at different distances from the Sun.
A pipe of length L that is closed at one end and open at the other end is resonating at its fundamental frequency. Which statement about the sound is correct?
A) The wavelength is 4L and there is a displacement node at the pipe's open end. B) The wavelength is 4L and there is a displacement antinode at the pipe's open end. C) The wavelength is L and there is a displacement node at the pipe's open end. D) The wavelength is L and there is a displacement antinode at the pipe's open end.
The Earth's oceans evolved
A) from condensation of water vapor in a hydrogen-oxygen rich atmosphere. B) from condensation of water vapor from volcanic eruptions. C) with accumulation of rainfall. D) as Earth warmed.