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More on ocean crust and density: at location "2" on both sides of the East Pacific Rise the crust is older and colder than the new crust at "1". The colder crust at "2" is more dense, so it sinks into the soft asthenosphere. This sinking crust at "2" pulls the new crust at "1" downhill along with it (similar to an avalanche!). This downhill force is one reason Earth's tectonic plates move; gravity helps drive plate tectonics! There are two gravity- caused forces that help move a tectonic plate: ridge push and slab pull Question: based on where it is happening, is crust at "2" pulling "1" downhill ridge push or slab pull? continent island arc SUBDUCTION ZONE marginal basin mid-ocean ridge trench 2 accretionary wedge sediments 3 ASTHENOSPHERE MESOSPHERE

More on ocean crust and density: at location "2" on both sides of the East Pacific Rise the crust is older and colder than the new crust at "1". The colder crust at "2" is more dense, so it sinks into the soft asthenosphere. This sinking crust at "2" pulls the new crust at "1" downhill along with it (similar to an avalanche!). This downhill force is one reason Earth's tectonic plates move; gravity helps drive plate tectonics! There are two gravity- caused forces that help move a tectonic plate: ridge push and slab pull Question: based on where it is happening, is crust at "2" pulling "1" downhill ridge push or slab pull? continent island arc SUBDUCTION ZONE marginal basin mid-ocean ridge trench 2 accretionary wedge sediments 3 ASTHENOSPHERE MESOSPHERE

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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More on ocean crust and density: at location "2" on both sides of the East Pacific Rise the crust is older and colder than the new crust at "1". The colder crust at "2" is more dense, so it sinks into the soft asthenosphere. This sinking crust at "2" pulls the new crust at "1" downhill along with it (similar to an avalanche!). This downhill force is one reason Earth's tectonic plates move; gravity helps drive plate tectonics! There are two gravity- caused forces that help move a tectonic plate: ridge push and slab pull J. Question: based on where it is happening, is crust at "2" pulling "1" downhill ridge push or slab pull? continent island arc SUBDUCTION ZONE trench marginal basin mid-ocean ridge 2. accretionary wedge sediments ASTHENOSPHERE MESOSPHERE
Transcribed Image Text:More on ocean crust and density: at location "2" on both sides of the East Pacific Rise the crust is older and colder than the new crust at "1". The colder crust at "2" is more dense, so it sinks into the soft asthenosphere. This sinking crust at "2" pulls the new crust at "1" downhill along with it (similar to an avalanche!). This downhill force is one reason Earth's tectonic plates move; gravity helps drive plate tectonics! There are two gravity- caused forces that help move a tectonic plate: ridge push and slab pull J. Question: based on where it is happening, is crust at "2" pulling "1" downhill ridge push or slab pull? continent island arc SUBDUCTION ZONE trench marginal basin mid-ocean ridge 2. accretionary wedge sediments ASTHENOSPHERE MESOSPHERE
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