The ‘Great Plains’ of the USA and the ‘Central Lowlands’ of Australia are examples of:
Structural Plains are primarily formed by the uplift of a part of the seafloor or continental shelf. They are horizontally bedded areas of the Earth’s crust that have remained relatively undisturbed by tectonic folding. The Great Plains of the USA and the Central Lowlands of Australia were formed through the gradual emergence of large-scale structural depressions. ANSWER: (A) Structural Plains
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In geomorphology, Structural Plains are among the most extensive landforms. They are created when a portion of the continental shelf or a submerged basin is uplifted as a single, massive unit due to epeirogenic (vertical) movements. Unlike alluvial plains, which are built by river deposits, structural plains are formed by the inherent structure of the rock layers. These plains, such as the Russian Platform or the Great Plains of North America, are characterized by vast, horizontally stratified rock layers. They are geographically significant because their flat, stable nature provides the world’s most extensive areas for large-scale mechanized agriculture.