Match List I with List II and select the correct answer using the code given below the Lists: List I (Island) List II (Location) A. Continental island 1. Mauritius B. Coral island 2. Madagascar C. Volcanic island 3. Andaman and Nicobar islands D. Mountain island 4. Maldives
A - 2, B - 4, C - 1, D - 3
Understanding Island Types and Locations
Islands are landmasses surrounded by water. They can be classified based on how they were formed. Let's explore the different types of islands mentioned and match them with the given examples.
Exploring Different Island Formations
- Continental Islands: These islands are essentially parts of a continental landmass that have been separated from the mainland by changes in sea level, subsidence of the land, or erosion. They typically have similar geological structures to the nearby continent.
- Coral Islands: These islands are formed by the accumulation of skeletal fragments of marine organisms, primarily corals. They are typically low-lying and found in tropical waters where coral reefs thrive. Atolls are ring-shaped coral islands surrounding a lagoon.
- Volcanic Islands: These islands are formed by volcanic activity. They can be peaks of volcanoes rising from the ocean floor (oceanic islands) or volcanoes on continental shelves. They often have mountainous or hilly terrain.
- Mountain Islands: This term can sometimes refer to islands formed by the peaks of submerged mountain ranges. While many volcanic islands fit this description, some mountain islands are formed from folded mountain belts that extend into the sea.
Matching Islands with Their Formation Types
Let's match the specific examples provided in List II with the types of islands in List I:
| List I (Island Type) | List II (Location) |
|---|---|
| A. Continental island | 1. Mauritius |
| B. Coral island | 2. Madagascar |
| C. Volcanic island | 3. Andaman and Nicobar islands |
| D. Mountain island | 4. Maldives |
Based on the characteristics of each island type and the examples:
- Madagascar (2) is a large island off the southeastern coast of Africa. It was once part of the supercontinent Gondwana and separated from Africa millions of years ago, making it a classic example of a continental island. Therefore, A matches with 2.
- Maldives (4) is a nation composed of many atolls in the Indian Ocean. Atolls are ring-shaped formations made of coral reefs surrounding a lagoon, characteristic of coral islands. Therefore, B matches with 4.
- Mauritius (1) is an island in the Indian Ocean formed by volcanic activity. It is part of the Mascarene Islands, which are volcanic in origin. Therefore, C matches with 1.
- Andaman and Nicobar islands (3) are located in the Bay of Bengal. These islands are believed to be the peaks of a submerged mountain range, an extension of the Arakan Mountains (part of the Himalayas) into the Indian Ocean. This fits the description of a mountain island. Therefore, D matches with 3.
Thus, the correct matching is: A - 2, B - 4, C - 1, D - 3.
Revision Table: Island Types
| Island Type | Formation | Example |
|---|---|---|
| Continental island | Separated part of a continent | Madagascar |
| Coral island | Accumulation of coral and organic material | Maldives |
| Volcanic island | Formed by volcanic activity | Mauritius, Hawaii |
| Mountain island | Peaks of submerged mountain ranges or volcanoes | Andaman and Nicobar islands, Japan |
Additional Information on Island Geography
Understanding island types helps us study geological history, biodiversity, and oceanography. For instance, continental islands often have similar flora and fauna to their parent continent, while oceanic islands (like many volcanic or coral islands) tend to have unique species due to isolation.
The size of islands varies greatly, from small islets to large landmasses like Greenland (which is geologically a continental island). The study of islands, known as island biogeography, explores how island size, distance from the mainland, and isolation affect the number and types of species found there.
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