Match the term with the appropriate phrase.
trench
a) spreading center
b) subduction zone
b) subduction zone
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For the purpose of gathering comparable data, the United Nations has imposed a precise definition of the meaning of urban upon the world's states
Indicate whether this statement is true or false.
Cloud-condensation nuclei over the ocean consist primarily of
A) clay particles. B) pieces of coral. C) salt particles. D) minute fragments of sea shells.
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) there is a change in chemical composition between inner and outer core. C) they gain speed. D) they lose speed.
In recent decades, unregulated open dumps have ________ in developing countries.
A. Remained the primary disposal method B. Been replaced by sanitary landfills C. Mostly become regulated D. Nearly disappeared E. Been replaced by incineration and methane generation