earth science

Laurentian Fan

Laurentian Fan 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 Laurentian Fan rather than just read about it. In short: The Laurentian Fan or Laurentian Abyss is an underwater depression off the eastern coast of Canada in the Atlantic Ocean. Location and origin Not a trench, but more of an "underwater valley", it is estimated to be at most ~19,685 feet (3.7 miles; 6.0 km) in depth.

Key takeaways

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

Reference excerpt

The Laurentian Fan or Laurentian Abyss is an underwater depression off the eastern coast of Canada in the Atlantic Ocean.

Location and origin

Not a trench, but more of an "underwater valley", it is estimated to be at most ~19,685 feet (3.7 miles; 6.0 km) in depth. The Laurentian Fan is a product of glaciation and water currents from the Gulf of Saint Lawrence. It is part of the Laurentian cone region, bound by the Laurentian Channel and the Sohm Abyssal Plain. The approximate coordinates are 43°40′N 56°10′W.

Ecosystem Towards the end of the 1980s, it was discovered unexpectedly that the fan is the site of hydrothermal vents with their own ecosystems functioning in the absence of sunlight. These supported organisms such as vesicomyid and thyasirid clams, as well as marine gastropods and other epifauna similar to those found in hydrothermal and cold seep environments elsewhere.

Popular culture The Laurentian Fan plays a geographic role in the plotline of the 1990 film The Hunt for Red October. The Laurentian Fan appears in the epilogue of the 2007 film Transformers, where the United States government dumps the remains of Megatron, the other defeated Decepticons, and the deceased Autobot Jazz into the fan, in hopes that the heavy underwater pressure will destroy their remains. The fan later reappears in the film's 2009 sequel Transformers: Revenge of the Fallen, from which the Decepticons recover and revive Megatron.

Worked examples

Example 1 — a first encounter with Laurentian Fan

Start with the simplest possible case. Write down what Laurentian Fan 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 Laurentian Fan 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 Laurentian Fan 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 Laurentian Fan

In research: Laurentian Fan 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 Laurentian Fan 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: Laurentian Fan is common in secondary-school and first-year university syllabi. It links to neighbouring topics Abyssal fans, Landforms of the Atlantic Ocean, Marine geography stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Laurentian Fan 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 Laurentian Fan in 20 minutes

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

Frequently asked questions

What is Laurentian Fan in simple terms?

The Laurentian Fan or Laurentian Abyss is an underwater depression off the eastern coast of Canada in the Atlantic Ocean. Location and origin Not a trench, but more of an "underwater valley", it is estimated to be at most ~19,685 feet (3.7 miles; 6.0 km) in depth.

Why does Laurentian Fan 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 Laurentian Fan?

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 Laurentian Fan.