The U-shape of a glacial valley is explained by
A) variation in glacier velocity.
B) the weight of overlying snow.
C) the action of meltwater.
D) the action of transported pebbles and boulders.
Answer: A
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Wave interference occurs in
A. longitudinal waves. B. transverse waves. C. both of the above D. none of the above
Scattering occurs more in water than air due to the greater density of water. Indicate whether the statement is true or false
What is the primary component of Earth’s current atmosphere?
a. carbon dioxide b. oxygen c. water vapor d. nitrogen e. argon
While Kayla is driving along a busy highway just outside a major city, she suddenly comes to a standstill in traffic. For the first time ever, she notices that alongside the highway are stretches of forest and wetland. She hears the noise of frogs and insects and birds that she never would have noticed if not trapped in traffic. Why does Kayla never notice these natural wonders on her route?
A) light pollution B) thermal pollution C) noise pollution D) acid rain