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Islet

Islet is a earth science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Islet rather than just read about it. In short: An islet (, EYE-lət) is generally a small island. Definitions vary and are not precise, but some suggest that an islet is a very small, often unnamed, island with little or no vegetation and unable to support human habitation.

Islet — main illustration
Islet — illustration

Key takeaways

  • Islet belongs to earth science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Islet to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Islet from memory before moving on to harder problems.

Reference excerpt

An islet (, EYE-lət) is generally a small island. Definitions vary and are not precise, but some suggest that an islet is a very small, often unnamed, island with little or no vegetation and unable to support human habitation. It may be made of rock, sand and/or hard coral; may be permanent or tidal (i.e. surfaced reef or seamount); and may exist in the sea, lakes, rivers, or any other sizeable bodies of water.

Definition

As suggested by its origin islette, an Old French diminutive of "isle", use of the term implies small size, but little attention is given to drawing an upper limit on its applicability. The World Landforms website says, "An islet landform is generally considered to be a rock or small island that has little vegetation and cannot sustain human habitation", and further that size may vary from a few square feet to several square miles, with no specific rule pertaining to size.

Other terms

Ait (/eɪt/, like eight) or eyot (/aɪ(ə)t, eɪt/), a small island. It is especially used to refer to river islands found on the River Thames and its tributaries in England. Cay or key, an islet formed by the accumulation of fine sand deposits atop a reef, especially in the Caribbean and West Atlantic. Rum Cay in the Bahamas and the Florida Keys off Florida are examples of islets. The French suffix -hou from the Scandinavian -holm, is used for the names of some islets in the Channel Islands, such as Écréhous, Burhou, Lihou and Les Houmets, and off Normandy, such as Tatihou. Inch, a term used especially in Scotland, from the Gaelic innis, which originally meant island, but has been supplanted to refer to smaller islands, such as the islet of Inch, off St Mary's Isle Priory, Inch Kenneth, Inchkeith, Keith Inch (no longer an island) and Inchcailloch. Motu, a reef islet formed by broken coral and sand, surrounding an atoll, especially in Polynesia, such as Motu One, Motu Nao and Motu Paahi. River island, an islet within the current of a river, such as the Île de la Cité in Paris. Rock, in the sense of a type of islet, is an uninhabited landform composed of exposed rocks, lying offshore, and having at most minimal vegetation, such as Albino Rock in the Palm Island group off Queensland, Australia. Sandbar or shoal, an exposed sandbar. Sea stack, a thin, vertical landform jutting out of a body of water. Skerry, a small rocky island, usually defined to be too small for habitation, especially in Ireland. Subsidiary islets, a more technical application, is applied to small land features isolated by water, lying off the shore of a larger island. Similarly, any emergent land in an atoll is also called an islet. Tidal island, small islands (not always islets) which lie closely off the coast of a mainland or a much larger island, being connected to it (and thus becomes a peninsula/promontory) in low tide and isolated by a channel in high tide.

In international law

Whether an islet is considered a rock or not, it can have significant economic consequences under Article 121 of the UN Convention on the Law of the Sea, which stipulates that "rocks which cannot sustain human habitation or economic life of their own shall have no exclusive economic zone or continental shelf". One long-term dispute over the status of such an islet was that of Snake Island. The International Court of Justice jurisprudence however sometimes ignores islets, regardless of inhabitation status, in deciding territorial disputes; it did so in 2009 in adjudicating the Romania–Ukraine dispute, and previously in the dispute between Libya and Malta involving the islet of Filfla.

List of islets There are thousands of islets on Earth: approximately 24,000 islands and islets in the Stockholm archipelago alone. The following is a list of example islets from around the world.

Notes

References Clive Schofield (2012). "Islands or Rocks, Is that the Real Question? The Treatment of Islands in the Delimitation of Maritime Boundaries". In Myron H. Nordquist; John Norton Moore; Alfred H.A. Soons; Hak-So Kim (eds.). The Law of the Sea Convention: US Accession and Globalization. Martinus Nijhoff Publishers. pp. 322–340. ISBN 978-90-04-20136-1.

Illustrations

Islet: Rockall, an islet located west of Ireland and Scotland
Rockall, an islet located west of Ireland and Scotland
Islet: Bàngchuí Island in Dalian, Liaoning, China, is a typical rock islet
Bàngchuí Island in Dalian, Liaoning, China, is a typical rock islet
Islet: Mōkōlea Rock in Kailua Bay, O‘ahu, 2.2 kilometres (1.4 mi) off North Beach, Marine Corps Base Hawaii
Mōkōlea Rock in Kailua Bay, O‘ahu, 2.2 kilometres (1.4 mi) off North Beach, Marine Corps Base Hawaii
Islet: Danes on the islet Danmark in Norway. It is a typical Nordic skerry.
Danes on the islet Danmark in Norway. It is a typical Nordic skerry.
Islet: A Tahitian motu off the island of Raiatea at sunset
A Tahitian motu off the island of Raiatea at sunset

Worked examples

Example 1 — a first encounter with Islet

Start with the simplest possible case. Write down what Islet claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In earth science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Islet before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Islet ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Islet

In research
Islet appears in earth science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Islet in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Islet is common in secondary-school and first-year university syllabi. It links to neighbouring topics Coastal and oceanic landforms, Coastal geography, Islands by type, so understanding it makes those chapters shorter.
In everyday life
Look for Islet outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Islet in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Islet means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Islet out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Islet in simple terms?

An islet (, EYE-lət) is generally a small island. Definitions vary and are not precise, but some suggest that an islet is a very small, often unnamed, island with little or no vegetation and unable to support human habitation.

Why does Islet matter?

Because it connects several earth science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Islet?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Islet.

Tags

  • Coastal and oceanic landforms
  • Coastal geography
  • Islands by type

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