Water able to be contained in the subsurface depends on
A) permeability.
B) porosity.
C) chemical composition.
D) none of these
Answer: B
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In electron diffraction, an electron moving at speed v << c acts like
a. a particle with momentum mv. b. a particle with position coordinate v/t. c. a wave with wavelength v/t. d. a wave with wavelength h/mv. e. both a particle with position coordinate v/t and a wave with wavelength v/t.
The expression(s) indicating the number of protons in a nucleus is
a. A b. N c. Z d. Z + N e. A – Z
Molecular clouds have "what it takes" which is:
A: lots of Hydrogen B: some Helium C: more than 100 times the mass of the Sun D: all of the above E: none of the above
The vast majority of stars in a newly formed star cluster are
A) very high-mass, type O and B stars. B) red giants. C) about the same mass as our Sun. D) less massive than the Sun.