Origin of Continents and Oceans in the world// relief order// wbslst//upper primary 

Relief Orders in the Origin of Continents and Oceans

1st Order Relief (Primary Relief)

Largest landforms on the Earth.

Includes:

Continents (Landmasses)

Ocean Basins

Covers the broadest division of the Earth's surface.

Examples: Asia, Africa, Pacific Ocean Basin, Atlantic Ocean Basin.

2nd Order Relief (Secondary Relief)

Formed mainly by plate tectonic processes.

On Continents:

Mountain Ranges (e.g., Himalayas)

Plateaus (e.g., Deccan Plateau)

Plains (e.g., Indo-Gangetic Plain)

On Ocean Floor:

Continental Shelf

Continental Slope

Abyssal Plain

Mid-Ocean Ridge

Ocean Trench

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3rd Order Relief (Tertiary Relief)

Smaller landforms produced by erosion and deposition.

Examples:

River Valleys

Waterfalls

Gorges

Meanders

Oxbow Lakes

Sand Dunes

Sea Cliffs

Beaches

Caves

Glacial Moraines

Quick Revision Table

Relief Order   ----Major Features Formation

1st Order-- Largest Continents & Ocean Basins Internal forces, crustal differentiation

2nd Order--- Large Mountains, Plateaus, Plains, Continental Shelf, Mid-Ocean Ridges, Trenches Plate tectonics, folding, faulting, volcanism

3rd Order ---Small Valleys, Waterfalls, Dunes, Beaches, Meanders, Caves Weathering, erosion, transportation & deposition

Mnemonic:

1st → Continents & Oceans

2nd → Mountains & Ocean-floor Features

3rd → Small Erosional & Depositional Landforms