Question

how can the islands stand without the tectonic plates​

Answer 1

Answer:

If the continents were eroded completely into the oceans there would be no continents and no land left. The continents are being eroded. Without plate tectonics that push the continents up the erosion would result in the continents disappearing under the surface of the oceans.

Explanation:

Answer 2

Answer:

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Explanation:

Island arcs

When the downward-moving slab reaches a depth of about 100 km (60 miles), it gets sufficiently warm to drive off its most volatile components, thereby stimulating partial melting of mantle in the plate above the subduction zone (known as the mantle wedge). Melting in the mantle wedge produces magma, which is predominantly basaltic in composition. This magma rises to the surface and gives birth to a line of volcanoes in the overriding plate, known as a volcanic arc, typically a few hundred kilometres behind the oceanic trench.