earth science

Rockall

Rockall 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 Rockall rather than just read about it. In short: Rockall () is a 17.15-metre-high (56 ft 3 in), uninhabitable granite islet in the North Atlantic Ocean. It is 301 kilometres (187 statute miles; 163 nautical miles) west of Soay, St Kilda, Scotland; 423 kilometres (263 statute miles; 228 nautical miles) north-west of Tory Island, Ireland; and 700 kilometres (430 statute miles; 380 nautical miles) south of Iceland.

Key takeaways

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

Reference excerpt

Rockall () is a 17.15-metre-high (56 ft 3 in), uninhabitable granite islet in the North Atlantic Ocean. It is 301 kilometres (187 statute miles; 163 nautical miles) west of Soay, St Kilda, Scotland; 423 kilometres (263 statute miles; 228 nautical miles) north-west of Tory Island, Ireland; and 700 kilometres (430 statute miles; 380 nautical miles) south of Iceland. The nearest permanently inhabited place is in North Uist, 367 kilometres (228 mi; 198 nmi) east in Scotland's Outer Hebrides. The granite rock from which Rockall is comprised formed during the Paleogene period, by magmatism as part of the North Atlantic Igneous Province. Rockall, Hasselwood Rock, 200 metres north, and the skerries of Helen's Reef two kilometers to the northeast are the only emergent parts of the Rockall Plateau. Twenty-nine-metre waves just east of Rockall were reported in 2006 as the largest ever recorded by scientific instruments in the open ocean. Rockall has appeared on maps since at least 1550 and in literature since at least 1698. Marine surveyors, scientists, adventurers, amateur radio operators, and environmental activists have variously landed on or briefly occupied the islet. The earliest documented landing on Rockall was in 1811 by a small Royal Navy party led by Basil Hall. Rockall's first named geographic location and only occupiable area is Hall's Ledge, named after Basil Hall. The longest known continuous occupation is 45 days, achieved solo in 2014 by Nick Hancock, a surveyor from Edinburgh. Possession of Rockall was for many decades deemed imperative to claims to the vast surrounding fisheries and oil-rich Atlantic seabed. The Irish Times claims to have reported on the economic value of Rockall's fisheries as long ago as 1861. Driven by Cold War national security concerns, the United Kingdom claimed Rockall in 1955 and incorporated it as part of Scotland in 1972. The UK claims a 12-nautical-mile (22-kilometre) territorial sea at Rockall. While never claiming sovereignty of Rockall, Ireland maintains that UK claims to Rockall are invalid. Denmark (on behalf of the Faroes) and Iceland have lodged claims of the adjoining seabed. In 2021, officers on a Marine Scotland patrol boat boarded an Irish fishing boat and ordered it to leave Rockall's 12 nautical mile zone. In 2024, the Irish and Scottish governments bilaterally proposed to allow Irish fishing boats to return to the 12 nautical mile zone. The UK's Foreign Secretary at the time, David Cameron, vetoed the proposal.

Etymology The origin and meaning of the name Rockall is uncertain. The name Rocabarraigh is used in Scots Gaelic folklore for a mythical rock that is supposed to appear three times, its last appearance being at the end of the world: "Nuair a thig Rocabarra ris, is dual gun tèid an Saoghal a sgrios". ('When Rocabarra returns, the world will likely come to be destroyed'). Another idea is the name Rockall derives from the Gaelic Sgeir Rocail, meaning 'skerry of roaring' or 'sea rock of roaring', although rocail can also be translated as 'tearing' or 'ripping'. The Scottish Gaelic name for Rockall, Ròcal, may derive from an Old Norse name that may contain the element fjall, meaning 'mountain'. It is also suggested the name Rockall is from the Norse *rok, meaning 'foaming sea', and kollr, meaning 'bald head'—a word that appears in other place names in Scandinavian-speaking areas. Legends around the seafaring Irish monk Brendan the Navigator state that he described Rockall in the sixth century. Irish mythology giant Fionn mac Cumhaill (Finn McCool) allegedly scooped up a chunk of what is now Ulster to fling at a Scottish rival. It missed, instead landing in the Irish Sea to become the Isle of Man. The void left behind filled with water to become Lough Neagh. McCool is then alleged to have thrown a pebble that became what is now widely known as Rockall—alternatively, the pebble flew off north-west as he lifted the chunk of land or when it landed into the sea. Rockall appears on a 1550 Portuguese chart as 'Rochol', and on one of 1606 as 'Rocol'. The map Nova Francia alio nomine dicta Terranova, anno 1504 (c. 1594), by Cornelis Claeszoon, Jan Doetecom, and Petrus Plancius, shows Rockall named Rookol. Rockall is named Rokol in its first-known literary reference, Martin Martin's 1698-published A Late Voyage to St Kilda. The book states: "... and from it lies Rokol, a small rock sixty leagues [300 km] to the westward of St Kilda; the inhabitants of this place call it Rokabarra."

Location In 1956, British scientist James Fisher referred to Rockall as "the most isolated small rock ... in the oceans of the world". An all round navigational beacon was first installed on Rockall's summit in 1972. Rockall's location was precisely determined by Nick Hancock during his 2014 expedition. Rockall's nearest land point is the uninhabited Soay, 301.3 kilometres (162.7 nmi) east in Scotland's St Kilda archipelago. Rockall's nearest inhabited area is Hirta, St. Kilda's largest island, 303.2 kilometres (163.7 nmi) east and populated intermittently at a single military base. Rockall's nearest permanently inhabited settlement is near Hogha Gearraidh crofting township, which is located 366.8 km (198.1 nmi) east of Rockall on North Uist's Aird an Rùnair headland, at Ordnance Survey grid reference NF 705 711 (57°36′33″N 7°31′7″W). Rockall is 423.2 kilometres (263.0 statute miles; 228.5 nautical miles) north-west of Tory Island, County Donegal, Ireland. Rockall is also 700 kilometres (430 statute miles; 380 nautical miles) south of Iceland.

History

Earliest mentions What is now known as Rockall appears in Scots and Irish mythology (see "Etymology" section above). Rockall appears on maps from 1550 onward. The first-known literary reference to the islet is in Martin Martin's A Late Voyage to St. Kilda, published in 1698 (see "Etymology" section above).

Shipping disasters

There have been various disasters on the neighbouring Hasselwood Rock and Helen's Reef (the latter having been named in 1830).

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Rockall

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

In research: Rockall 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 Rockall 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: Rockall is common in secondary-school and first-year university syllabi. It links to neighbouring topics Extreme points of the United Kingdom, Geological type localities, Greenpeace campaigns, so understanding it makes those chapters shorter.
In everyday life: Look for Rockall 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 Rockall in 20 minutes

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

Frequently asked questions

What is Rockall in simple terms?

Why does Rockall 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 Rockall?

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 Rockall.