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Oceanic crust: Quiz


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Question 1: The most voluminous volcanic rocks of the ocean floor are the mid-oceanic ridge basalts (________), which are derived from low-potassium tholeiitic magmas.
Mid-ocean ridgeDivergent boundarySeafloor spreadingPassive margin

Question 2: Oceanic crust is the part of Earth's ________ that surfaces in the ocean basins.
LithosphereCrust (geology)Plate tectonicsMantle (geology)

Question 3: Layer 1 consists of unconsolidated or semiconsolidated sediments, usually thin or even not present near the ________ but thickens farther away from the ridge.
Passive marginMid-ocean ridgeSeafloor spreadingDivergent boundary


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