Discussion
Match the following :
| Type of Coral Reef | Properties |
|---|---|
| (a) Barrier reef | (i) Attached to coast |
| (b) Fringing reef | (ii) Separated from the coast |
| (c) Atoll | (iii) Encloses a central lagoon |
Answer: A
The correct matching is (a)-(ii) (b)-(i) (c)-(iii).
- Barrier reef: separated from the coast by a wide, deep lagoon, as in the Great Barrier Reef.
- Fringing reef: attached to the coast, growing directly from the shore.
- Atoll: a ring of reef enclosing a central lagoon, with no central island.
Darwin explained the three as a sequence around a subsiding volcanic island: fringing reef, then barrier reef, then atoll. Every other code makes either the fringing reef separated from the coast or the barrier reef attached to it.
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