earth science

Víðgelmir

Víðgelmir 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 Víðgelmir rather than just read about it. In short: Víðgelmir (Icelandic pronunciation: [ˈviðˌcɛlmɪr̥]) is a lava tube situated in the Hallmundarhraun lava field (formed around 900 AD) in west Iceland, around 2 km southeast of Fljótstunga farm in Hvítársíða, Borgarfjörður. The roof of the lava tube has collapsed, creating two large openings near its north end which are the only known entrances.

Key takeaways

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

Reference excerpt

Víðgelmir (Icelandic pronunciation: [ˈviðˌcɛlmɪr̥]) is a lava tube situated in the Hallmundarhraun lava field (formed around 900 AD) in west Iceland, around 2 km southeast of Fljótstunga farm in Hvítársíða, Borgarfjörður. The roof of the lava tube has collapsed, creating two large openings near its north end which are the only known entrances. Víðgelmir is 1585 m long and the largest part of the cave passage is 15.8 m high and 16.5 m wide, making it by far the largest of its kind in Iceland. The cave has a wide entrance but narrows down in some places. An iron gate was installed at the first constriction in 1991 to preserve those of the delicate lava formations or speleothems which hadn't already been destroyed. Evidence of human habitation, probably dating to the Viking Age, has been discovered in the cave and is preserved in the National Museum of Iceland. Long stretches of the cave floor are very rough and shouldn't be navigated without a guide. Access and guided tours are provided at nearby Fljótstunga. Lava tubes are formed when a low-viscosity lava flow develops a continuous and hard crust which then thickens and forms a roof above the molten lava stream. When the eruption subsides, the still-molten lava moving beneath the crust will continue to drain downhill, leaving an open lava tube. Many other lava tubes have been discovered in Hallmundarhraun, most notably Surtshellir and Stefánshellir.

References

External links Official website

Illustrations

Worked examples

Example 1 — a first encounter with Víðgelmir

Start with the simplest possible case. Write down what Víðgelmir 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 Víðgelmir 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 Víðgelmir 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 Víðgelmir

In research: Víðgelmir 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 Víðgelmir 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: Víðgelmir is common in secondary-school and first-year university syllabi. It links to neighbouring topics Caves of Iceland, Ice caves, Lava tubes, so understanding it makes those chapters shorter.
In everyday life: Look for Víðgelmir 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 Víðgelmir in 20 minutes

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

Frequently asked questions

What is Víðgelmir in simple terms?

Why does Víðgelmir 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 Víðgelmir?

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 Víðgelmir.