Which of the following is the largest crustal plate on Earth with an area of over 103,000,000 km 2 ?

Correct — D. The Pacific plate is the largest tectonic plate on Earth, covering the 103 million km² the question itself quotes.

It is almost entirely oceanic. It floors most of the Pacific Ocean, and its margins are mostly subduction zones and trenches — the belt known as the Ring of Fire.

Every other plate on the list carries a continent and is smaller, so option (d) is the only fit.

Why the others are wrong

• (a)
  African plate — The African plate carries the continent plus a wide margin of surrounding sea floor and is one of the major plates — but it ranks below the Pacific in area, not above it.
• (b)
  South American plate — The South American plate is a major plate among the smaller ones, and it carries a continent rather than an ocean basin. Its western edge is where the Nazca plate subducts to raise the Andes.
• (c)
  Eurasian plate — The Eurasian plate is the one most candidates picture first because it underlies the biggest landmass. Land area is not plate area, and the Pacific plate is larger.

The lithosphere is broken into a handful of major plates and many minor ones. A plate's size is its whole area, sea floor included, not the size of the land sitting on it.

That distinction is the entire question. The Pacific plate is nearly all ocean floor, so on a map it reads as empty blue while being the biggest plate there is.

Its edges are largely destructive margins, where oceanic crust dives beneath neighbouring plates and builds trenches, island arcs and volcanoes.

Key facts

• The Pacific plate is the largest tectonic plate, with an area above 103 million km².
• It is predominantly oceanic, unlike the African, Eurasian and South American plates, which each carry a continent.
• The Ring of Fire runs around the margins of the Pacific basin, where oceanic plate edges subduct.
• The Hawaiian island chain sits on the Pacific plate, built over a hotspot.

Common traps

• Choosing Eurasian because Eurasia is the largest landmass, when plate area includes ocean floor.
• Assuming the largest plate must be the one carrying the largest continent.

No directly related past PYQ was found.