The Doppler effect is a characteristic of
A. sound waves.
B. water waves.
C. light waves.
D. all of the above
Answer: D
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The majority of soil organic matter is concentrated in the
a. O horizon of leaf litter b. A horizon of topsoil c. O and A horizons d. C horizon e. B horizon
Which of the following occurs when a layer of wet haze is formed?
A. Hydrophobic nuclei are present. B. Condensation is occurring on some nuclei. C. The relative humidity of the air layer is less than 75 percent. D. Particles in the air decrease in size.
The most dangerous type of volcano is a
A) cinder cone. B) cinder cone whose magmas are interacting with groundwater. C) huge shield volcano. D) composite volcano.
In arid climates, most small streams are ________
A) nonexistent B) ephemeral C) intermittent D) perennial E) without channels