Water precipitated over land completes its cycle as it
A) enters streams and lakes and makes its way to the oceans.
B) percolates into the ground.
C) evaporates from the surface to the atmosphere.
D) all of the above
D
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Which of the following statements concerning pterosaurs or their innovations is FALSE?
a. Although a separate line, the pterosaurs were part of a much larger radiation of reptile lines that included dinosaurs. b. Among the many innovations that pterosaurs had for flight, were hollow, strut-supported bones that lightened their skeletons. c. Although pterosaurs could fly, they were poorly designed for flight and were quickly replaced when better-flying birds arose d. Casts of pterosaur brains show that their brain design was similar to that of birds and modified for 3-dimensional flight. e. Most of the pterosaurs that we have fossils from were adapted for life in coastal areas, but they probably lived in other areas as well.
Given that the bond energy of N2 is 946 kJ/mole, the bond energy of O2 is 498 kJ/mole and the NO bond energy is 631 kJ/mole, how much energy is required to react 1 mole of nitrogen molecules according to the following reaction? N2 + O2 ? 2 NO
A) 182 kJ B) -182 kJ C) 813 kJ D) -813 kJ E) 2075 kJ
For the same discharge, gradient, and channel cross-section, a stream with a boulder-strewn bed would be more turbulent than one with a sandy bed.
a. true b. false
Which of the following statements about the wetted perimeter is true?
A. The larger the wetted perimeter the faster the velocity. B. The smaller the wetted perimeter the faster the velocity. C. The larger the wetted perimeter the greater the discharge. D. The smaller the wetted perimeter the greater the discharge.