1 A) Banded iron formations B) Sedimentary rocks C) Red beds D) All Archean rocks 2 A) DNA and RNA B) Amino acids C) Formaldehyde molecules D) Cyanide molecules 3 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078746361/561661/as.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"> (18.0K)</a>]]> A) 3 billion years ago B) 550 million years go C) 600 million years ago D) 1 billion years ago 4 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078746361/561661/au.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"> (21.0K)</a>]]> A) Archean B) Paleozoic C) Proterozoic D) Mesozoic 5 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078746361/561693/90_pcshld_gm_240p.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"> (40.0K)</a>]]> A) Alaska B) the Midwest C) the Southwest D) the Pacific Coast 6 A) ediacara organisms B) bacteria C) jellyfish D) green algae 7 A) Their impact on Earth generated energy. B) Their bombardment of Earth caused them to sink to the core. C) Their gravitational contraction generated energy. D) Their radioactive decay of isotopes generated energy. 8 A) 3.5 billion years old B) 3.96 to 3.8 billion years old C) 1.6 to 1.8 million years old D) 1 to 2 billion years old 9 A) Canadian shields B) continental crust C) Archean shields D) Precambrian shields 10 A) Laurentia B) North America C) Pangaea D) Rodinia 11 A) They were single-celled organisms. B) They were multi-celled organisms. C) They breathed oxygen. D) They were photosynthetic. 12 A) the age of rocks from the Moon B) the age of zircon grains in granitic crustal rocks C) the age of meteorites D) all of the above answers are correct 13 A) the Archean Shield B) the Northern Shield C) the Proterozoic Shield D) the Canadian Shield 14 A) ammonia B) water vapor C) ozone D) methane 15 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078746361/561693/129_yrsago_noart23.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"> (21.0K)</a>]]> A) Rodinia B) Pangaea C) Laurentia D) Gondwana 16 A) ammonia and hydrogen B) hydrogen and helium C) water vapor and methane D) nitrogen and carbon dioxide 17 A) prokaryotes B) eukaryotes C) algae D) fungi 18 A) there weren't any stromatolites at that time B) there wasn't any free oxygen in the atmosphere C) there wasn't any iron in rocks of that age D) there was too much iron to be oxidized
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