earth science

Maui Nui

Maui Nui 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 Maui Nui rather than just read about it. In short: Maui Nui is a modern geologists' name given to a prehistoric Hawaiian island and the corresponding modern biogeographic region. Maui Nui is composed of four modern islands: Maui, Molokaʻi, Lānaʻi, and Kahoʻolawe.

Key takeaways

Maui Nui 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 Maui Nui to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Maui Nui from memory before moving on to harder problems.

Reference excerpt

Maui Nui is a modern geologists' name given to a prehistoric Hawaiian island and the corresponding modern biogeographic region. Maui Nui is composed of four modern islands: Maui, Molokaʻi, Lānaʻi, and Kahoʻolawe. Administratively, the four modern islands comprise Maui County (and a tiny part of Molokaʻi called Kalawao County). Long after the breakup of Maui Nui, the four modern islands retained plant and animal life similar to each other. Thus, Maui Nui is not only a prehistoric island but also a modern biogeographic region.

Geology

Maui Nui formed and broke up during the Pleistocene Epoch, which lasted from about 2.58 million to 11,700 years ago. Maui Nui is built from seven shield volcanoes. The three oldest are Penguin Bank, West Molokaʻi, and East Molokaʻi, which probably range from slightly over to slightly less than 2 million years old. The four younger volcanoes are Lāna'i, West Maui, Kaho'olawe, and Haleakalā, which probably formed between 1.5 and 2 million years ago. At its prime 1.2 million years ago, Maui Nui was 14,600 square kilometres (5,600 sq mi), 50% larger than today's Hawaiʻi Island. The island of Maui Nui included four modern islands (Maui, Molokaʻi, Lānaʻi, and Kahoʻolawe) and landmass west of Molokaʻi called Penguin Bank, which is now completely submerged.

Maui Nui broke up as rising sea levels flooded the connections between the volcanoes. The breakup was complex because global sea levels rose and fell intermittently during the Quaternary glaciation. About 600,000 years ago, the connection between Molokaʻi and the island of Lāna'i/Maui/Kahoʻolawe became intermittent. About 400,000 years ago, the connection between Lāna'i and Maui/Kahoʻolawe also became intermittent. The connection between Maui and Kahoʻolawe was permanently broken between 200,000 and 150,000 years ago. Maui, Lāna'i, and Molokaʻi were connected intermittently thereafter, most recently about 18,000 years ago during the Last Glacial Maximum. Today, the sea floor between these four islands is relatively shallow, about 500 metres (1,600 ft) deep. At the outer edges of former Maui Nui, as at the edges of all Hawaiian Islands, the sea floor plummets to the abyssal plain of the Pacific Ocean.

Biogeography

The term Maui Nui is also used as a modern biogeographic region of Hawaii. Long after the breakup of Maui Nui, the four modern islands retained similar plant and animal life. Many plant and animal species occur across multiple islands of former Maui Nui but are found nowhere else in Hawaii. Many of Hawaii's native species declined or became extinct after Polynesian arrival or in the modern era, making the study of Hawaiian biogeography more complicated. Among Hawaii's native birds, the ʻākohekohe (Palmeria dolei) only survives on Maui, but it also occurred on Molokaʻi until 1907. The black mamo (Drepanis funerea) was historically documented only on Molokaʻi until its extinction in 1907, but fossils are also known from Maui. The Maui Nui icterid-like gaper (Aidemedia lutetiae) was never documented historically, but fossils are known from Maui and Molokaʻi. Among Hawaii's native plants, the maui hala pepe (Dracaena rockii) is known from Maui and Molokaʻi, and survives on both islands. Pua ʻala (Brighamia rockii) survives only on Molokaʻi, but was historically documented on Maui and Lāna'i. Additional examples of plants and animals endemic to the Maui Nui region appear in List of Hawaiian animals extinct in the Holocene and Endemism in the Hawaiian Islands. Conversely, the ʻelepaio (genus Chasiempis) have a disjunct distribution. These birds occur on Hawaiʻi Island, Oʻahu, and Kauaʻi, but are curiously absent from the islands of former Maui Nui (both currently and in the fossil record). Some bird species use the term "Maui Nui" in their common names, such as the Maui Nui large-billed moa-nalo (Thambetochen chauliodous), Maui Nui icterid-like gaper (Aidemedia lutetiae), Maui Nui ʻakialoa (Akialoa lanaiensis), Maui Nui ʻalauahio (Paroreomyza montana), and Maui Nui finch (Telespiza ypsilon). All of these species survived for thousands of years after the breakup of Maui Nui, and the Maui population of the Maui Nui ʻalauahio survives to the present. Thus, Maui Nui is not just a prehistoric island but also a modern biogeographic region.

Illustrations

Worked examples

Example 1 — a first encounter with Maui Nui

Start with the simplest possible case. Write down what Maui Nui 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 Maui Nui 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 Maui Nui 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 Maui Nui

In research: Maui Nui 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 Maui Nui 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: Maui Nui is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cenozoic Hawaii, Former islands of the United States, Geography of Hawaii, so understanding it makes those chapters shorter.
In everyday life: Look for Maui Nui 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 Maui Nui in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Maui Nui 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 Maui Nui out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Maui Nui in simple terms?

Why does Maui Nui 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 Maui Nui?

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 Maui Nui.