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A six inches deep layer of humus forms the initial
layers of the soil in the islands. Below this, two feet of sandstone
is found followed by sand and fresh water. Due to excessive salt
in the soil down the beach, vegetation is limited to a few plants
like shrubs, flowering plants and small hedges. In the interiors
of the island, more vegetation like mangroves, banyan etc prevails.
Only the coconut palms are able to grow just about anywhere and
are a major contributing factor to the lifestyle of the natives.
The coconut palms are considered so significant that it has been
classified as the national tree.
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