1 A) Baltica B) Rodinia C) Pangaea D) Laurentia 2 A) been rigid since the formation of Earth B) have the same specific gravity C) different densities D) the same densities 3 A) the same temperature as B) always 10 degrees less than C) cooler temperatures than D) hotter temperatures than 4 A) because of the principle of included fragments B) It is much less stable than the sandstone. C) because of the principle of superposition D) It is much more stable than the sandstone 5 A) feldspar B) iron and quartz C) feldspar, quartz, and mica D) iron- and magnesium-rich minerals 6 A) by seams called orogens B) by seams called faults C) by molten rock D) the erosion of mountains 7 A) sea-floor spreading B) evolution C) outgassing D) plate tectonics 8 A) the Ediacaran fauna B) the Burgess Shale fauna C) trilobites D) corals 9 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078746361/561693/130_cell_ca_221c.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"> (11.0K)</a>]]> A) A B) B C) it is impossible to tell D) both came into existence at the same time 10 A) global warming B) formation of ozone C) outgassing D) the Varagnian glaciation 11 A) hydrothermal vents B) magma chambers C) trenches D) transform faults 12 A) methane B) ammonia C) nitrogen D) oxygen 13 A) Heavier materials sank toward the core, and lighter materials rose. B) Widely separated land areas started looking different from one another. C) The Atlantic and Pacific Oceans developed from the original global ocean. D) Outgassing formed an oxygen atmosphere. 14 A) decaying vegetation B) photosynthesis C) volcanoes D) automobile engines 15 A) acid rain B) ultraviolet radiation C) tiny meteorites D) tornadoes and hailstorms 16 A) Earth's oceans probably formed long before Earth's atmosphere and covered most of Earth's surface. B) Earth's earliest atmosphere was primarily composed of oxygen and contained very little water vapor, carbon dioxide, or nitrogen. C) Earth's earliest oceans were much deeper than today, and the continents rose much higher in elevation. D) Earth's earliest atmosphere probably contained large quantities of water vapor, carbon dioxide, and nitrogen, but contained very little oxygen gas. 17 A) was established at least 10,000 years ago B) was established at least 600 million rears ago C) has been continually varying throughout Earth's existence D) has not changed since the formation of Earth 18 A) outgassing B) photosynthesis C) gravity D) wind
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