Approximately what proportion of the world's CO2 emissions comes from motor vehicles and industrial facilities in urban areas?
A. one-tenth
B. one-quarter
C. one-third
D. one-half
E. two-thirds
Answer: E
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Why is water a necessary component of the melting process in subduction zones?
a) The addition of water lowers the friction experienced by rising magma. b) Water is a liquid, and rock needs to encounter a liquid in order to become a liquid. c) The addition of water lowers the melting temperature of rock. d) Water creates a buoyant force that allows the magma to rise. e) Water changes the density of the rock, allowing the rock to melt.
Why does the velocity of a stream generally increase downstream even though the gradient decreases?
If the oil reserves under the ANWR were the only source of oil, how long would it last?
What will be an ideal response?
In Canada, the First Nations were the Inuit and Aleuts
a. True b. False Indicate whether the statement is true or false