science

Grierson Reef

Grierson Reef is a 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 Grierson Reef rather than just read about it. In short: Grierson Reef (Filipino: Bahura ng Burunyugan 14); Sin Cowe East Island (Vietnamese: Đảo Sinh Tồn Đông); Mandarin Chinese: 染青沙洲; pinyin: Rǎnqīng shāzhōu, is a cay on the eastern part of the Union Banks of the Spratly Islands in the South China Sea. The island has been occupied by Vietnam since 1978.

Key takeaways

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

Reference excerpt

Grierson Reef (Filipino: Bahura ng Burunyugan 14); Sin Cowe East Island (Vietnamese: Đảo Sinh Tồn Đông); Mandarin Chinese: 染青沙洲; pinyin: Rǎnqīng shāzhōu, is a cay on the eastern part of the Union Banks of the Spratly Islands in the South China Sea. The island has been occupied by Vietnam since 1978. It is also claimed by China (PRC), the Philippines, Vietnam, and Taiwan (ROC).

Geography The original island (before additional land reclamation) was approximately 160 metres (520 ft) long, 60 metres (200 ft) wide, and surrounded by a sandy shore ranging from 5 to 10 metres (16 to 33 ft) in width. The natural land area of the island was approximately 1.6 hectares (4.0 acres). Both ends of the island feature sandbars that shift seasonally with wind and wave patterns. In 2014, Vietnam constructed a seawall around the island and expanded it (210 metres [690 ft] long and 100 metres [330 ft] wide), adding approximately 1.2 hectares (3.0 acres) of land, bringing the total area of the island to approximately 2.8 hectares (6.9 acres). From 2019 onwards major defensive structures were built on the island, such as bunkers, coastal fortifications, and possibly missile pads. On June 7, 2022, the Vietnam Buddhist Sangha inaugurated the Sinh Tồn Đông Pagoda on the island. Starting in March 2025, Vietnam began land reclamation activities to expand Sinh Tồn Đông Island while dredging a harbor on the southern part of the island.

Illustrations

Worked examples

Example 1 — a first encounter with Grierson Reef

Start with the simplest possible case. Write down what Grierson Reef claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In 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 Grierson Reef 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 Grierson Reef 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 Grierson Reef

In research: Grierson Reef appears in 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 Grierson Reef 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: Grierson Reef is common in secondary-school and first-year university syllabi. It links to neighbouring topics Asia geography stubs, Island stubs, Islands of Vietnam, so understanding it makes those chapters shorter.
In everyday life: Look for Grierson Reef 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 Grierson Reef in 20 minutes

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

Frequently asked questions

What is Grierson Reef in simple terms?

Why does Grierson Reef matter?

Because it connects several 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 Grierson Reef?

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 Grierson Reef.