All water—groundwater, surface water, and frozen water—flows downslope in response to
A) pressure.
B) hydraulic gradient.
C) permeability.
D) gravity.
Answer: D
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The interstellar medium is composed of mainly _____
a. equal parts of gas and dust b. mostly dust and some gas c. mostly gas and some dust d. dust only e. gas only
An ideal gas is compressed in a well-insulated chamber using a well-insulated piston. This process is
A) isochoric. B) isothermal. C) adiabatic. D) isobaric.
Which of the following did NOT contribute to the thinning of the Martian atmosphere during its early history?
A) the photodissociation of water molecules by ultraviolet light in the atmosphere B) the stripping of the atmosphere by solar wind particles from the Sun C) the consumption of carbon dioxide by photosynthetic bacteria D) atmospheric gases being blasted into space by large impacts
A star's ________ parallax is found by using the spectral lines to estimate the spectral class and luminosity of distant stars
Fill in the blank(s) with correct word