22 climate change

22 climate change - Global Change Geology A verifies that...

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Chapter 23: Global Change in the Earth System Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Global Change Geology verifies that the Earth constantly changes. Why does it constantly change? A plastic asthenosphere permits tectonic plate motion. A star is close enough to warm Earth and its atmosphere. Temp. permits liquid water, thus, weathering and erosion. Biotic evolution has transformed the planet.
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Chapter 23: Global Change in the Earth System Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak The Earth System Life on Earth is due to interaction between the Lithosphere. Atmosphere. Hydrosphere. The l Earth System z is comprised of these physical components interacting with the biosphere.
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Chapter 23: Global Change in the Earth System Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak The Earth System The interlinkage of the physical and the biological. Global changes transform or modify both realms. There are many ways to describe changes. Rate – Gradual vs. catastrophic. Frequency – Unidirectional vs. cyclic. Agency – Geogenic vs. anthropogenic. Change occurs in both a unidirectional and a cyclic manner.
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Chapter 23: Global Change in the Earth System Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Unidirectional Changes Evolution of the atmosphere and oceans. Volcanic gases created an early atmosphere. Liquid water condensed to form the oceans. Evolution of the solid Earth. Planetesimal accretion. Melting and differentiation. Iron sank to the center. Produced a layered Earth. Iron alloy core. Rocky mantle.
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Chapter 23: Global Change in the Earth System Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Unidirectional Changes Evolution of the atmosphere and oceans. Life appeared quickly on Earth, by 3.8 Ga. Living organisms modified the entire surface of Earth. Changed the composition of the atmosphere. Altered the chemistry of the oceans.
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Chapter 23: Global Change in the Earth System Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Physical Cycles The supercontinent cycle. Plate tectonics drives a dance of the continents. Ocean basins open and close. Continental land masses collide and rift apart again. Supercontinents (like Pangaea) have formed several times.
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Chapter 23: Global Change in the Earth System Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Physical Cycles The sea-level cycle – SL is geologically unstable. SL has gone up and down many times in Earth history.
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Chapter 23: Global Change in the Earth System Earth: Portrait of a Planet, 3 rd edition, by Stephen Marshak Biogeochemical Cycles Chemical fluxes between living and nonliving.
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This note was uploaded on 02/22/2012 for the course CE 70 taught by Professor Johnson during the Fall '07 term at Berkeley.

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22 climate change - Global Change Geology A verifies that...

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