Earth 100 Climate - Earth 100 Climate Through Earth's History Precambrian From the origin of Earth to 544ma The Earth is 4.6 billion years old How

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Earth 100: Climate Through Earth's History   Precambrian From the origin of Earth to 544ma The Earth is 4.6 billion years old     How do we know the age of rocks? Relative ages - which are older Absolute age - date rock was formed, in millions of years (ma)     Ancient Sedimentary Rocks : Sediment deposited in ancient seas Examples: Clay (shale) Sand (sandstone) Calcium Carbonate (carbonate rock)   The Law of Superposition: o Younger sediments are deposited on top of older sediments o This provides a means to determine relative again       Fossils: o Life forms evolve over time o Provides a means to determine relative age   Radioactive Isotopes: o Provide means to determine absolute age o Decay = change from one element or isotope (parent) into another (daughter) o Population decays with a known and constant rate, so ratio of  parent/daughter atoms provide a measure of time Accelerator Mass Spectrometer     Paleoclimate: study of climate pattern through Earth's history  
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How has climate changed through time? How has the atmosphere changed? Is there a relationship between CO 2  in the atmosphere and past climates?   Models and all kinds of observation show us: High CO2 is linked with a hot climate   How do we learn about ancient climate? 1.
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This note was uploaded on 03/30/2008 for the course EARTH 100 taught by Professor Pratigyapolissar during the Spring '07 term at Pennsylvania State University, University Park.

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Earth 100 Climate - Earth 100 Climate Through Earth's History Precambrian From the origin of Earth to 544ma The Earth is 4.6 billion years old How

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