What are islands?

Islands are landforms that are completely surrounded by water. They can vary in size, from small uninhabited rocks to large landmasses like Greenland. Islands are found in oceans, seas, rivers, and lakes. They can be formed in various ways, such as through volcanic activity, the rising of land above sea level, or the erosion of larger landmasses. Some islands are populated with people, while others remain natural and are home to diverse wildlife. They are important for biodiversity, tourism, and sometimes for strategic locations in trade and defense.

This question related to Chapter 2 Social Science Class 6th NCERT.
From the Chapter 2. Oceans and Continents.
Give answer according to your understanding.