ISLAND

An island is an area of land completely surrounded by water and smaller than a continent. Islands can be found in oceans, seas, lakes, or rivers and are significant natural landforms with various origins and characteristics.​

Key Features and Types of Islands

Continental islands: Parts of continental shelves that remain above sea level, such as Greenland and Madagascar, typically composed of continental crust material.​

Oceanic islands: Formed by volcanic activity or rising of the ocean floor, often located far from continental landmasses; the Hawaiian Islands are a classic example.​

Other types: These include tidal islands (connected to the mainland at low tide), barrier islands (long, narrow sandy islands parallel to coastlines), coral islands (formed by coral reef buildup), and artificial islands (human-made for various purposes).​

Archipelago: A group or chain of islands is called an archipelago.​

How Islands Are Formed

Volcanic activity: Underwater volcanoes erupt, building land up above sea level to form new islands (e.g., Surtsey in Iceland).​

Tectonic movements: Shifting plates can break off land or push up undersea mountains to create islands.​

Deposition: Rivers or the sea deposit sediments that accumulate to form new landmasses surrounded by water.​

Erosion: Rising sea levels or erosion can isolate parts of the land, turning them into islands.​

Islands provide important habitats, influence oceanic and atmospheric currents, and serve as significant locations for biodiversity and human communities.