WVGSA Grade 8 Science Practice Questions - West Virginia General Summative Assessment Grade 8 Science Exam

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Why does dense oceanic crust sink (subduct) beneath less dense continental crust when an oceanic plate collides with a continental plate?

Oceanic crust is thinner and denser (composed of basalt), while continental crust is thicker and less dense (composed of granite) Continental crust is colder than oceanic crust Ocean water pushes the continental crust downward Magnetic forces pull oceanic crust toward Earth's core

Correct Answer:

Oceanic crust is thinner and denser (composed of basalt), while continental crust is thicker and less dense (composed of granite)

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