science

Gruta das Agulhas

Gruta das Agulhas 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 Gruta das Agulhas rather than just read about it. In short: Gruta das Agulhas (Needle Cave) is a cave located along the promontory of Ponta dos Coelhos, in the Bay of Refugo, in the civil parish of Porto Judeu, in the municipality of Angra do Heroísmo, the Portuguese archipelago of the Azores. The cave is situated along the coast of Salga, along the high cliffs of the promontory, formed from an accumulation of lava flows.

Key takeaways

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

Reference excerpt

Gruta das Agulhas (Needle Cave) is a cave located along the promontory of Ponta dos Coelhos, in the Bay of Refugo, in the civil parish of Porto Judeu, in the municipality of Angra do Heroísmo, the Portuguese archipelago of the Azores. The cave is situated along the coast of Salga, along the high cliffs of the promontory, formed from an accumulation of lava flows. It was formed during the eruption of the volcano associated with the Algar do Carvão, which flowed to the sea, arriving at the coast of Serretinha, in the civil parish of Feteira. The flow spread to Porto Judeu, forming a coastal geomorphology of black basalt of large dimensions, arribas and coves of dangerous cliffs. As the lava, which was primarily aa and pahoehoe, flowed into these tubes slowly decreased, it left hollow caverns opening into galleries, some of various kilometres of length. It obtained its name from the great quantity of needle-like sedimentary deposited on the rocks and ceiling of the lava tube, ranging from .2–.5 centimetres (0.079–0.197 in). The 250.5 metres (822 ft) gallery is situated over a smaller gallery that is 30 metres (98 ft) wide. The tube's extent is carved by layers (or steps) sculpted by various lava flow cycles. The Gruta das Agulhas is at its highest point 5.4 metres (18 ft) and at the widest point 4.5 metres (15 ft). The cave was discovered and explored until its exit at the sea by the Associação Espeleológica Os Montanheiros in 1967. Since it was discovered, the cave has been studied for its varied fauna and geological importance. Of note, were species of Troglofauna, including Pseudoblothrus vulcanus, Macarorchestia martini and Pseudosinella ashmoleorum, in addition to endemic species like Phthiracarus falciformis, Orchestia chevreuxi and Pseudosinella azorica. Eventually, the space was illuminated and an entranceway constructed to restrict access into the space by Os Montanheiros. Due to sea erosion, access was restricted to the public.

References

Sources Barcelos, Paulo (1 December 2011), Gruta das Agulhas (PDF) (in Portuguese), Horta (Azores), Portugal: SIARAM

Worked examples

Example 1 — a first encounter with Gruta das Agulhas

Start with the simplest possible case. Write down what Gruta das Agulhas 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 Gruta das Agulhas 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 Gruta das Agulhas 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 Gruta das Agulhas

In research: Gruta das Agulhas 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 Gruta das Agulhas 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: Gruta das Agulhas is common in secondary-school and first-year university syllabi. It links to neighbouring topics Angra do Heroísmo, Azores geography stubs, Caves of the Azores, so understanding it makes those chapters shorter.
In everyday life: Look for Gruta das Agulhas 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Gruta das Agulhas” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Gruta das Agulhas in 20 minutes

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

Frequently asked questions

What is Gruta das Agulhas in simple terms?

Why does Gruta das Agulhas 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 Gruta das Agulhas?

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 Gruta das Agulhas.