Explanation: In geography, understanding the definitions of various landforms is essential for identifying and differentiating between them. The term "island" specifically refers to a piece of land that is completely surrounded by water. This definition is crucial because it distinguishes an island from other landforms such as peninsulas, capes, and plains.
An island is a landmass that is entirely surrounded by water, which can be an ocean, sea, lake, or river. Islands can vary greatly in size, from tiny islets to large landmasses like Greenland. They are formed through various geological processes, including volcanic activity, sedimentation, and the rising of sea levels.
A peninsula, on the other hand, is a piece of land that is surrounded by water on three sides but is connected to a larger landmass. Examples of peninsulas include the Indian subcontinent and the Iberian Peninsula. The key difference between an island and a peninsula is the connection to a larger landmass.
A cape is a point of land that extends into a body of water, typically with a more rounded shape than a peninsula. Capes are often characterized by their strategic importance in navigation and defense. Examples include Cape Horn and Cape Cod.
A plain is a large area of flat land with few trees and a gentle slope. Plains are not surrounded by water and are typically found in the interior of continents. They are formed by various geological processes, including erosion and sedimentation.
Understanding these definitions is crucial for correctly identifying and differentiating between these geographical features. The correct answer to the question is "Island" because it is the only option that fits the description of a piece of land totally surrounded by water.