science

Yamato 691

Yamato 691 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 Yamato 691 rather than just read about it. In short: The Yamato 691 (abbreviated Y-691) is a 4.5 billion year old chondrite meteorite discovered by members of the Japanese Antarctic Research Expedition on the blue ice field of the Queen Fabiola Mountains (Yamato Mountains) in Antarctica, on December 21, 1969. History Yamato 691 was one among 9 meteorite specimens identified by the Japanese Expedition Team in 1969.

Key takeaways

Yamato 691 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Yamato 691 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Yamato 691 from memory before moving on to harder problems.

Reference excerpt

The Yamato 691 (abbreviated Y-691) is a 4.5 billion year old chondrite meteorite discovered by members of the Japanese Antarctic Research Expedition on the blue ice field of the Queen Fabiola Mountains (Yamato Mountains) in Antarctica, on December 21, 1969.

History Yamato 691 was one among 9 meteorite specimens identified by the Japanese Expedition Team in 1969. It was later studied at the Max Planck Institute for Chemistry, Mainz, Germany. In April 2011, NASA and co-researchers from the United States, South Korea and Japan have found a new mineral named "Wassonite" in Yamato 691.

Composition and classification This meteorite is a stony enstatite chondrite. Minerals reported from the meteorite include:

Troilite Spinel Augite Diopside Enstatite Pigeonite Albite Nepheline Iron Olivine Wassonite – discovered in April, 2011

Worked examples

Example 1 — a first encounter with Yamato 691

Start with the simplest possible case. Write down what Yamato 691 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 Yamato 691 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 Yamato 691 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 Yamato 691

In research: Yamato 691 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 Yamato 691 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: Yamato 691 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Chondrite meteorites, Meteorites found in Antarctica, so understanding it makes those chapters shorter.
In everyday life: Look for Yamato 691 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 Yamato 691 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Yamato 691 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 Yamato 691 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Yamato 691 in simple terms?

Why does Yamato 691 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 Yamato 691?

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 Yamato 691.