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Above is a map of the seafloor of Pacific Ocean just off the coast of Washington state and Victoria Province, Canada. The seafloor map is of the Juan de Fuca Ridge and is colored according to the age of the Oceanic Crust underlying the ocean bottom. Notice that 10 and 12 million year old rocks are present east of the Juan de Fuca ridge, but not west of the ridge. Furthermore, it appears that the colored stripes of oceaninc crust are truncated against the shore line of western North America (bold red line). Given your knowledge of Plate Tectonics and Plate Boundaries, what type of plate boundary might best explain the absence of rocks older than 8 million years west of the ridge?

Above is a map of the seafloor of Pacific Ocean just off the coast of Washington state and Victoria Province, Canada. The seafloor map is of the Juan de Fuca Ridge and is colored according to the age of the Oceanic Crust underlying the ocean bottom. Notice that 10 and 12 million year old rocks are present east of the Juan de Fuca ridge, but not west of the ridge. Furthermore, it appears that the colored stripes of oceaninc crust are truncated against the shore line of western North America (bold red line). Given your knowledge of Plate Tectonics and Plate Boundaries, what type of plate boundary might best explain the absence of rocks older than 8 million years west of the ridge?

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
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50°N 45°N 0 14 Ages of rocks in millions of years T 12 10 SEAL CANIC ROCKS 50 0 8 10 12 14 16 0 50 100 100 W S E 130 W (Ages in millions of years) 6 200 2 Plate boundary (red line) between Juan de Fuca and North American tectonic plates 300 500 8 = volcano 400 West Coast of North America 0/ 500 miles 1000 kilometers W Above is a map of the seafloor of Pacific Ocean just off the coast of Washington state and Victoria Province, Canada. The seafloor map is of the Juan de Fuca Ridge and is colored according to the age of the Oceanic Crust underlying the ocean bottom. Notice that 10 and 12 million year old rocks are present east of the Juan de Fuca ridge, but not west of the ridge. Furthermore, it appears that the colored stripes of oceaninc crust are truncated against the shore line of western North America (bold red line). Given your knowledge of Plate Tectonics and Plate Boundaries, what type of plate boundary might best explain the absence of rocks older than 8 million years west of the ridge?
Transcribed Image Text:50°N 45°N 0 14 Ages of rocks in millions of years T 12 10 SEAL CANIC ROCKS 50 0 8 10 12 14 16 0 50 100 100 W S E 130 W (Ages in millions of years) 6 200 2 Plate boundary (red line) between Juan de Fuca and North American tectonic plates 300 500 8 = volcano 400 West Coast of North America 0/ 500 miles 1000 kilometers W Above is a map of the seafloor of Pacific Ocean just off the coast of Washington state and Victoria Province, Canada. The seafloor map is of the Juan de Fuca Ridge and is colored according to the age of the Oceanic Crust underlying the ocean bottom. Notice that 10 and 12 million year old rocks are present east of the Juan de Fuca ridge, but not west of the ridge. Furthermore, it appears that the colored stripes of oceaninc crust are truncated against the shore line of western North America (bold red line). Given your knowledge of Plate Tectonics and Plate Boundaries, what type of plate boundary might best explain the absence of rocks older than 8 million years west of the ridge?
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