Answer :
Final answer:
Limestone islands are primarily composed of limestone, which is a sedimentary rock formed from marine organisms. These islands feature karst topography, white sandy beaches made of coral and shellfish remnants, and are often surrounded by clear turquoise waters.
Explanation:
Limestone islands, often found in tropical areas, have distinctive features compared to islands composed of other rock types. These islands are primarily made up of limestone, a sedimentary rock formed from the skeletal fragments of marine organisms such as coral and mollusks over millions of years.
Typical features of these islands include karst topography, characterized by caves, sinkholes, and underground rivers due to the solubility of limestone in water and weak acid solutions. Over time, rainfall erodes the limestone, creating unique landscapes. Another common feature is the presence of white sandy beaches. These are not made from traditional sand, but instead are composed of the crushed remnants of the coral and shellfish that helped form the limestone of the island.
Also, usually, these islands are surrounded by clear turquoise waters due to the reflection of the sunlight by the white sand in the shallow areas surrounding the island.
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