The ________ is weaker and less rigid than the overlying lithosphere
A) crust
B) lower mantle
C) upper mantle
D) asthenosphere
Answer: D
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What is the greenhouse effect? What are the gases involved in this process? What are some of the events that could happen if global warming progresses?
A U.S. cap-and-trade (or emissions trading) program was used to reduce emissions of ____.
A. nitrogen oxides (NOx) B. carbon monoxide (CO) C. sulfur dioxide (SO2) D. chlorofluorocarbons (CFCs) E. lead
Airlines sometimes reroute planes away from polar regions during solar storms because
a. ?radio communication can be affected by solar storms. b. ?solar storms can lead to severe turbulence. c. ?solar storms increase air temperature, which can present a danger. d. ?the plane could get hit by particles. e. ?the sky can become too bright for safe navigation.
The language with the most native speakers is ________
What will be an ideal response?