Explain what a subduction zone is and how it relates to volcanic activity and earthquakes.

At a subduction zone, the oceanic crust usually sinks into the mantle beneath lighter continental crust. Called the "Ring of Fire," these subduction zones are responsible for the world's biggest earthquakes, the most terrible tsunamis, and some of the worst volcanic eruptions.

Explanation:

land

explanation:

australia is the flattest continent, and it has vast plains.