Question

an oceanic plateau
a spreading ridge
a continental shelf
a large reef structure
yes, it’s the kerguelen plateau and it covers 1.25 million square kilometers.
identify features of the sea floor. 5 of 5
how did this oceanic plateau form?
it formed as continental crust detached from the continent at a transform plate boundary
it formed in an island arc as the volcanic islands fused together.
it formed from flood basalts associated with a hot spot.
it is oceanic crust uplifted by a large thrust fault.

Explanation:

First Question (Identify the sea - floor feature):

The Kerguelen Plateau is known to be an oceanic plateau. A spreading ridge is a mid - ocean ridge where new oceanic crust is formed, and the Kerguelen Plateau is not a spreading ridge. A continental shelf is the shallow part of the ocean adjacent to a continent, and the Kerguelen Plateau is not a continental shelf. A large reef structure is a biological structure made by corals, and the Kerguelen Plateau is a geological feature, not a reef. So the correct option is "An oceanic plateau".

The Kerguelen Plateau formed from flood basalts associated with a hot spot. Continental crust detaching at a transform plate boundary is not the mechanism for the formation of the Kerguelen Plateau. Formation in an island arc as volcanic islands fused together is not related to the Kerguelen Plateau's formation. Oceanic crust uplifted by a large thrust fault is also not the correct mechanism for the formation of the Kerguelen Plateau.

Answer:

An oceanic plateau

Second Question (How did the oceanic plateau form):