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Placer (geography)

Placer (geography) 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 Placer (geography) rather than just read about it. In short: Placer (Portuguese: parcel or pracel) is a term used by Portuguese and Spanish navigators and cartographers to refer to a certain kind of submerged bank or reef. Commonly the bottom of such a reef is sandy, but there are some where the bottom is muddy or stoney.

Placer (geography) — main illustration
Placer (geography) — illustration

Key takeaways

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

Reference excerpt

Placer (Portuguese: parcel or pracel) is a term used by Portuguese and Spanish navigators and cartographers to refer to a certain kind of submerged bank or reef. Commonly the bottom of such a reef is sandy, but there are some where the bottom is muddy or stoney. Although most reefs designated as placer are flat and shallow, exceptionally there are some that do not share those characteristics and are known as placer acantilado. A placer usually provides an anchorage for seagoing vessels.

Etymology The word placer derives from the Spanish placer, meaning shoal or alluvial/sand deposit, from plassa (place) from Medieval Latin placea (place) the origin word for "place" and "plaza" in English. The word in Spanish is thus derived from placea and refers directly to an alluvial or glacial deposit of sand or gravel. Spanish navigator and explorer Pedro Sarmiento de Gamboa commented that placer likely originated as a term derived from placer mining in the Antilles, where pearl fishing was done mostly on shallow sandy reefs, which were compared to the sandy grounds in rivers where gold nuggets were found. Since the word Placer in Spanish means 'pleasure', according to 16th century scientist Juan Pérez de Moya a placer is every dangerous submerged shallow bank. Moya claims that the landforms that received this denomination did so in an ironical manner, for it would be everything but a pleasure to navigate those treacherous waters under the constant risk of running aground. However, other navigators contradict Moya by claiming that such a shallow ground would provide mariners with a much welcome anchorage after a long open sea journey, for in some placeres the waters are not as rough as in the open seas.

Use of the term The term appears in Spanish nautical charts as placer, although Pedro Sarmiento de Gamboa writes it as placel. The Portuguese language equivalent and derived term is pracel or parcel. In present times some of the geographical names used by the Spanish cartographers, such as Placer de los Colorados, Placer de los Estudios, Placer de Playa Grande, Placer de Montechristi, Placer de Quatro Cayos, Placer de la Gallega, Placer de las Tortugas and Placer de los Siete Hermanos have become obsolete or have been superseded by English terms. Still, many other placeres mentioned in 19th-century Spanish Navigation Instruction Manuals were not even named. Not all placeres are in the open sea; the Isla Cangrejos in the Orinoco Delta was described as having a placer that stretched from its NE point composed of ground-coffee coloured hard sand.

Paracel Islands. Portuguese navigators whose vessels frequented the South China Sea as early as at the beginning of the 16th century, were the first to refer to the Paracel Islands as Ilhas do Pracel. French explorers and cartographers used the Portuguese terms Pracel or Parcel. In the "Map of the coast of Tonquin and Cochinchina", made in 1747 by Pierre d'Hondt, the dangerous cluster of reefs of the Ilhas do Pracel was labeled "Le Paracel". Parcel dos Abrolhos and Parcel das Paredes, in the Abrolhos Archipelago area off the Brazilian coast in the Atlantic Ocean. Placer de los Roques, also known as Cay Sal Bank. Placer de la Serranilla, historical name of the Serranilla Bank. Placer de la Víbora, former name of Pedro Bank. Placer de Rosalinda, Spanish name of Rosalind Bank. Placer de la Misteriosa, Spanish name of Misteriosa Bank. Placer de la Guaira, Spanish name of La Guaira Bank. Placer de los Caicos, Spanish name of the Caicos Bank. Placer de las Bóvedas, in the Mediterranean Sea east of Estepona, a good fishing and scuba diving site.

Cartography

See also Ocean bank Reef

References

External links Fishing in the Placer de la Guaira

Illustrations

Placer (geography): The Placer de los Roques marked as Pracel in a 1762 French map.
The Placer de los Roques marked as Pracel in a 1762 French map.
Placer (geography): "Le Pracel" north of Cuba in a 1708 De L'Isle map
"Le Pracel" north of Cuba in a 1708 De L'Isle map
Placer (geography): "I. de Pracel" south of Hainan in a 16th-century Nicolaes Visscher II map
"I. de Pracel" south of Hainan in a 16th-century Nicolaes Visscher II map
Placer (geography): "Le Paracel" off the coast of Vietnam in a 1771 Rigobert Bonne Map of Tonkin, China, Formosa and Luzon
"Le Paracel" off the coast of Vietnam in a 1771 Rigobert Bonne Map of Tonkin, China, Formosa and Luzon

Worked examples

Example 1 — a first encounter with Placer (geography)

Start with the simplest possible case. Write down what Placer (geography) 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 Placer (geography) 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 Placer (geography) 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 Placer (geography)

In research
Placer (geography) 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 Placer (geography) 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
Placer (geography) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Geography terminology, Spanish words and phrases, Undersea banks, so understanding it makes those chapters shorter.
In everyday life
Look for Placer (geography) 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 Placer (geography) in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Placer (geography) means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Placer (geography) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Placer (geography) in simple terms?

Placer (Portuguese: parcel or pracel) is a term used by Portuguese and Spanish navigators and cartographers to refer to a certain kind of submerged bank or reef. Commonly the bottom of such a reef is sandy, but there are some where the bottom is muddy or stoney.

Why does Placer (geography) 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 Placer (geography)?

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 Placer (geography).

Tags

  • Geography terminology
  • Spanish words and phrases
  • Undersea banks

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