Catalonia PAU Geology & Env Sci Practice Questions - Catalonia PAU Geology And Environmental Sciences (Geologia I Ciències Ambientals - PAU Catalunya 2026) Exam

What causes the abrupt increase in seismic wave velocity known as the Mohorovičić (Moho) discontinuity?

The transition from solid lower mantle to liquid outer core. The boundary between the atmosphere and lithosphere. The change from liquid outer core to solid inner core. The compositional boundary between low-density crustal rocks and high-density mantle peridotite.

Correct Answer:

The compositional boundary between low-density crustal rocks and high-density mantle peridotite.

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