Deep-ocean floor made of basaltic crust.

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Multiple Choice

Deep-ocean floor made of basaltic crust.

Explanation:
The key idea is oceanic crust. The deep-ocean floor is built from basaltic rock, which is denser and mafic, formed at mid-ocean ridges as new crust cools and then spreads outward to fill ocean basins. So the description points to ocean basins, the regions covered by this basaltic oceanic crust. The other terms don’t describe the crust itself: an Ice Age is a time period of glaciation, a passive margin is a tectonically inactive transition zone between oceanic and continental crust, and a submarine canyon is a deep trench-like feature within the ocean floor, not the type of crust.

The key idea is oceanic crust. The deep-ocean floor is built from basaltic rock, which is denser and mafic, formed at mid-ocean ridges as new crust cools and then spreads outward to fill ocean basins. So the description points to ocean basins, the regions covered by this basaltic oceanic crust. The other terms don’t describe the crust itself: an Ice Age is a time period of glaciation, a passive margin is a tectonically inactive transition zone between oceanic and continental crust, and a submarine canyon is a deep trench-like feature within the ocean floor, not the type of crust.

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