A/an __________ __________ is a deep trough in the crest of many mid-ocean ridges.
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Q3: Oceanic crust is mostly composed of _.
Q13: Oceans cover about _ percent of the
Q14: _ _ is a mixture of clay
Q16: The average thickness of oceanic crust is
Q17: Beyond the Mid-Oceanic Ridge system are flat,
Q19: Continental margins on both sides of the
Q20: Deep, V-shaped, steep-walled valleys called _ _
Q21: Moving away from mid-ocean ridges, oceanic crust
Q22: When two oceanic plates converge, the sinking
Q40: At seafloor vents, bacteria produce energy from
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