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#oceanic crust #continental crust #volcano formation #mountain building #ring of fire

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#isostasy #continental crust #oceanic crust #crustal thickness #density #buoyancy #topography

🌊⚫️🪨

#mafic #oceanic crust #basalt #gabbro #ocean floor #sima

🌊⚫️�

#basalt #oceanic crust #pillow lava #seafloor rock #mid ocean ridge #underwater volcano #marine geology