Yes, shale is actually older than limestone. Limestone traces back to about 350 million years ago while shale traces back to about 510 million years ago.
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Because they appeared quickly in geological time, and moulted like other arthropods, trilobites serve as excellent index fossils.
Answer:
Many island countries are spread over an archipelago, as is the case with the Federated States of Micronesia and Indonesia (both of which consist of thousands of islands).
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Sovereign states and states with limited recognition.
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The advantage of having one major product like this is the ability of the government to fully focus on it and ensure that the yield and quality are boosted through various experiments and technological innovations.
The disadvantage is that if anything goes wrong such as an outbreak of disease associated with cotton then the economy will be greatly diminished as a result of low yield and less GDP which will affect the government and people.
