1 A) volcanoes B) conduction of heat in the mantle C) continental drifting D) convection currents in the mantle 2 A) slab push and ridge pull B) slab push C) the heat from radioactive decay D) spreading mid-ocean ridges 3 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078746361/561688/99_curstmap_ca_170c.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (46.0K)</a>]]> A) A B) C C) B D) D 4 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078746361/561753/ge17_sc4_4.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (61.0K)</a>]]> A) A B) B C) C D) D 5 A) cooling of material near the core, heating of material near the crust B) rising of dense material, sinking of less dense material C) maintenance of a stable temperature in the center of a convection current D) sinking of cooler material from the crust, rising of heated material from near the core
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