BIOL 2051 Chapter : How The Earth Was Made Answered
Document Summary
Chapter 17 how the earth was made (history channel video) British expert in thermodynamics who suggested planet was once completely molten and has been slowly cooling. Using thermodynamics, he alculated the molten planet would need roughly 20 million years for the planet to cool. Unaware of radioactivity that prevented the planet from cooling as quickly as he thought it would. Geologist that used radioactive particles (first to use radiometric dating) to accurately date the planet. Traces of uranium found throughout the rocks of the earth decayed to lead. By measuring the proportion of uranium to lead, he could accurately say the age of the earth. Created by volcanic vents erupting into the ocean. All rocks formed 3. 5 billion years ago are pillow lava. Rained for millions of years to form water-world. Granite from (1)superheated water and (2) sulfic lava (much lighter and less dense than volcanic crust) Primeval organism that lived off sunlight and filled the atmosphere with oxygen.
