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A1. What is the area-weighted mean depth of the world's oceans? What is the mean age of the world's oceanic crust? (Area-weighted says that the mean value takes into account the different sizes of the ocean basins.) A2. At what average rate is ocean crust generated? Use your answer from 1. in this calculation. Your answer should have units of km²/m.y. (millions of years). A3. If spreading rate was greatly increased for a long interval of time, explain what the effect would be on global sea level. (The volume of water in the ocean does not change and the area of the continents and oceans does not change.) A4. Refer to the hysometric curve from lecture and estimate how a doubling of crustal spreading rate would impact the percent of the earth covered by ocean. Explain your reasoning.

A1. What is the area-weighted mean depth of the world's oceans? What is the mean age of the world's oceanic crust? (Area-weighted says that the mean value takes into account the different sizes of the ocean basins.) A2. At what average rate is ocean crust generated? Use your answer from 1. in this calculation. Your answer should have units of km²/m.y. (millions of years). A3. If spreading rate was greatly increased for a long interval of time, explain what the effect would be on global sea level. (The volume of water in the ocean does not change and the area of the continents and oceans does not change.) A4. Refer to the hysometric curve from lecture and estimate how a doubling of crustal spreading rate would impact the percent of the earth covered by ocean. Explain your reasoning.

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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A. Ocean Crust/lithosphere age and depth Given the following information: Ocean and adjacent seas Area (106 km²) 181 94 74 Pacific Atlantic Indian Mean depth (m) 3940 3575 3840 Depth-age of oceanic crust: D = 2650 + 320 * t ¹/2 (D is in meters, and t is in m.y.) (Despite flattening in the age-depth curve for crust older than 70 Ma, you can use this formula for all of the lithosphere.) A1. What is the area-weighted mean depth of the world's oceans? What is the mean age of the world's oceanic crust? (Area-weighted says that the mean value takes into account the different sizes of the ocean basins.) A2. At what average rate is ocean crust generated? Use your answer from 1. in this calculation. Your answer should have units of km²/m.y. (millions of years). A3. If spreading rate was greatly increased for a long interval of time, explain what the effect would be on global sea level. (The volume of water in the ocean does not change and the area of the continents and oceans does not change.) A4. Refer to the hysometric curve from lecture and estimate how a doubling of crustal spreading rate would impact the percent of the earth covered by ocean. Explain your reasoning.
Transcribed Image Text:A. Ocean Crust/lithosphere age and depth Given the following information: Ocean and adjacent seas Area (106 km²) 181 94 74 Pacific Atlantic Indian Mean depth (m) 3940 3575 3840 Depth-age of oceanic crust: D = 2650 + 320 * t ¹/2 (D is in meters, and t is in m.y.) (Despite flattening in the age-depth curve for crust older than 70 Ma, you can use this formula for all of the lithosphere.) A1. What is the area-weighted mean depth of the world's oceans? What is the mean age of the world's oceanic crust? (Area-weighted says that the mean value takes into account the different sizes of the ocean basins.) A2. At what average rate is ocean crust generated? Use your answer from 1. in this calculation. Your answer should have units of km²/m.y. (millions of years). A3. If spreading rate was greatly increased for a long interval of time, explain what the effect would be on global sea level. (The volume of water in the ocean does not change and the area of the continents and oceans does not change.) A4. Refer to the hysometric curve from lecture and estimate how a doubling of crustal spreading rate would impact the percent of the earth covered by ocean. Explain your reasoning.
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