Since the industrial revolution, greenhouse gas emissions from human activity consist mostly of
a. carbon dioxide.
b. methane.
c. nitrous oxide.
d. hydrochlorofluorocarbon HFC-23.
Answer: A
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Chinese interregional migration in recent years has primarily been from
A) mountain regions to coastal regions. B) big cities to medium size cities. C) rural to urban areas. D) urban to rural areas. E) factory jobs to farming jobs.
Why does the central United States from Texas to the Ohio Valley experience the greatest frequency of tornadoes on Earth? What time of year do they occur and why?
What will be an ideal response?
In the diagram below, B is the
A) hadal zone.
B) mesopelagic zone.
C) epipelagic zone.
D) benthic zone.
What is the cause of Jupiter's slight flattening, which results in an equatorial diameter 6% greater than its polar diameter?
A. its frequent reversal of its magnetic poles B. nuclear fission within its core C. its massive gravitational pull D. its rapid spin cycle