1 A) geothermal energy B) Earth's core is hotter for no reason. C) the decay of radioactive elements D) other molten rocks 2 A) they cooled inside Earth's crust B) they cooled quickly C) they cooled slow D) they are derived from volcanoes 3 A) rhyolite B) diorite C) dunite D) basaltic 4 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078746361/561676/28_melttemp_ss_050c_.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (17.0K)</a>]]> A) it decreases gradually B) it decreases sharply C) it increases gradually D) it increases sharply 5 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078746361/561676/28_melttemp_ss_050c.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (12.0K)</a>]]> A) magnesium B) calcium C) iron D) sodium 6 A) geothermal gradient B) radioactive decay C) hydrothermal gradient D) Thermal energy 7 A) from the cementation of mineral grains B) from the crystallization of magma C) from increased pressures and temperatures D) from the compaction of loose sediments 8 A) higher pressures and lower temperatures B) higher temperatures C) lower temperatures D) the same temperature 9 A) lava B) molten C) extrusive D) intrusive 10 A) Partial melting B) Bowen's reaction series C) Geothermal gradients D) Branches of crystallization 11 A) diorite B) basaltic glass C) gabbro D) obsidian 12 A) felsic B) fine-grained C) porphyritic D) coarse-grained 13 A) well-defined layers B) glassy texture C) contains pebbles D) made of calcite 14 A) heat and pressure exerted on a coarse-grained metamorphic rock B) heat and pressure compacted carbonized material C) mineral deposited by hydrothermal solutions in quartz veins D) highly viscous magma cooled quickly at Earth's surface
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