Sea urchins help preserve kelp in kelp forests
Indicate whether the statement is true or false
FALSE
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P-waves refract at the boundary between inner and outer core because
A. there is a change of phase between inner and outer core. B. they lose speed. C. they gain speed. D. there is a change in chemical composition between inner and outer core.
The Marcellus and Devonian Shales
A. can be drilled without any pollution risk to the environment. B. are a potential vast source of oil in the eastern United States. C. could result in the drilling of thousands of wells in populated places.
A growth boundary is associated with
A) Smart Growth Programs. B) utility networks. C) Urban Density Reduction programs. D) emergency medical services. E) Captive Growth Programs.
The single major source for photochemical reactants in the United States are
A) steel mills and the agricultural industry. B) automobiles. C) electrical generation stations. D) rapid transit, buses, and excessive use of light rail systems.