Which statement about average stream velocity is true?
A)Velocity is higher in the upper reaches where gradients are steeper.
B)Velocity is constant along the river's course.
C)Velocity decreases downstream because the gradient is less steep.
D)Velocity increases in the downstream direction.
E)Velocity decreases downstream because of frictional forces.
D
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Which of the following is not something that erupts from composite volcanoes?
A) toxic gas B) fast-moving mudflows called lahars C) pyroclastics D) thin, silica-rich lava you could probably outrun
What does Newton's gravitational model fail to consider when determining influences on tides?
a. The position of the moon and sun b. The attraction of the moon, sun, and Earth c. The position of continental landmasses d. The influence of the moon and sun together e. The circular movement of water in an ocean basin
In what decade did the first energy shocks occur, in the form of drastically higher oil prices?
A) 1890s B) 1910s C) 1930s D) 1950s E) 1970s
It has been difficult to reduce sediment pollution in streams because
A. sediment comes from point sources. B. only chemicals are easily controlled. C. sediment comes from nonpoint sources. D. very small amounts are dangerous.