Why does a clay rock body generally have a medium-to-high porosity but a poor hydraulic conductivity?
What will be an ideal response?
Answer: Clay is composed of tightly packed, small, flattened grain particles. Although voids between clay particles are small, clay is able to hold a lot of water. The movement of water, however, is impeded by poorly connected, small pore spaces.
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To initiate star formation in a cloud, you need a __________
a. slow contraction of a molecular cloud b. rotating molecular cloud c. magnetic field d. shock
Including relativistic effects, doubling the speed of a object:
a. doubles its momentum. b. more than doubles its momentum. c. less than doubles its momentum. d. has no effect on its momentum.
Heat escapes from a planet's surface into space by thermal radiation. Planets radiate almost entirely in the wavelength range of the
A) infrared. B) radio. C) visible. D) ultraviolet. E) none of the above
What observational evidence supports the fact that our universe is static and unchanging?
a. detection of the cosmic microwave background (CMB) b. dark sky at night c. redshift of galaxies d. evolution of galaxies with distance e. None of the other choices are correct.