The question asks to identify the type of coral reef that forms directly along the coastline. Understanding the characteristics and formation of different coral reef types is key to answering this question.
C) Fringing reef — Fringing reefs are the most common type of coral reef and grow directly from the shore, forming a border along the coastline and surrounding islands. They are attached to the landmass.
The question asks to identify the specific type of coral reef that is ring-shaped and encloses a lagoon. This requires knowledge of the different classifications of coral reefs based on their structure and relationship to landmasses.
B) Atoll — An atoll is a ring-shaped coral reef that completely or partially encloses a lagoon. Atolls typically form from fringing reefs around volcanic islands that subsequently subside below sea level, leaving the coral ring behind.
The question asks to identify the scientist who proposed the theory of atoll formation through the subsidence of volcanic islands. This requires knowledge of key historical figures in geology and their contributions.
B) Charles Darwin — Charles Darwin, during his famous voyage on HMS Beagle, developed and published his theory on the formation of atolls. He proposed that atolls originate from fringing reefs around volcanic islands. As the volcanic island slowly subsides or sinks, the coral reef continues to grow upwards, eventually forming a barrier reef and then, as the island completely submerges, a ring-shaped atoll enclosing a lagoon.
The question asks about the geographical feature that separates a barrier reef from the coastline. Understanding the different types of coral reefs and their characteristic locations relative to land is key to answering this question.
Correct Option: B) A wide and deep lagoon. Barrier reefs are characterized by being separated from the mainland or an island by a wide and often deep body of water called a lagoon.
The question asks to identify which of the given options is a coral atoll in India. To answer this, one needs to know the geographical characteristics and formation types of the mentioned island groups.
Correct Option: B) Lakshadweep Islands are a group of islands in the Arabian Sea, known for their coral origin and atoll formations. They are entirely composed of coral deposits.
The question asks to identify the location among the given options where coral reefs are NOT found in India. This requires knowledge of the major coral reef regions in India.
Correct Option: C) Sundarbans