Describe those surface features that indicate water once flowed on Mars
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Two kinds of formations hint at water flowing over the surface. Outflow channels appear to have been cut by massive floods carrying as much as 10,000 times the volume of water flowing down the Mississippi River. In a matter of hours or days, such floods swept away landscape features and left outflow channels. The number of craters formed on top of the outflow channels show that they are billions of years old. The valley networks look like meandering riverbeds that may have formed over long period. The valley networks are also located in the old, cratered southern hemisphere, so they must be very old as well. There are other signs that water has flowed on the Martian surface, some of which may be only a few years old
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The enthalpy of mixing for a pair of polymer molecules is related to the _____________parameter of the two molecules.
Fill in the blank(s) with the appropriate word(s).
The cosmic background radiation permeating the universe has the spectrum of a 2.7-K blackbody radiator. What is the peak wavelength of this radiation? The constant in Wien's law is 0.0029 m ? K
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Why do supernova remnants have limited lifetimes?
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A comet's tail ________.
A. always trails behind the comet B. is gas and dust expelled from the comet's nucleus by the Sun's heat and radiation pressure C. is composed mainly of captured particles from the solar wind D. is gas and dust pulled off the comet by the Sun's gravity