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#oceanic trench #mariana trench #hadal zone #marine geology

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#underwater rock #seabed #marine geology #sea bottom

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#snorkel #diving mask #reef structure #coral habitat #underwater rock #marine geology #snorkeling spot

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#seamount #underwater hill #ocean floor elevation #submerged peak #marine geology

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#marine geology #geological oceanography #bathymetry #seafloor mapping #underwater volcano #seamount

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

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#ocean drilling program #marine geology #earth science #research drilling #scientific drilling #iodp

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#sea arch #coastal arch #coastal erosion #marine geology #sea stack arch #natural window