The red color of emission nebulae comes from the ________
A) energy emission of oxygen
B) energy emission of hydrogen
C) conversion of infrared light to visible light
D) energy emission of helium
E) conversion of ultraviolet light to visible light
B
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In the United States today, the approach which best reduces the volume and weight of municipal solid waste is ________
A) in open pits B) municipal sewage treatment C) incineration D) sanitary landfills E) composting
A(n) ________ represents a former meltwater channel or tunnel in glacial ice that was filled with sand and gravel
A) yazoo ridge B) esker C) valley plain D) kettle
During the warm phase of ENSO, warmest waters are found along the
A. Gulf Stream extending to Great Britain. B. equator in the eastern Pacific, west of South America. C. southwest of North America. D. western Pacific extending from Japan to Australia.
Select all of the following ecosystems that are known to have high levels of biodiversity?
a. Coral reefs b. estuaries c. rivers d. streams e. All of the above